(Further Reading): Remove paywalled and JS-requiring URLs.

fp.texi

@@ -1628,6 +1628,12 @@ results.  There are a few good references that we recommend
 for further reading, and for finding other important material
 about computer arithmetic:
 
+We include URLs for these references when we were given them, when
+they are morally legitimate to recommend; we have omitted the URLs
+that are paywalled or that require running nonfree JavaScript code in
+order to function.  We hope you can find morally legitimate sites
+where you can access these works.
+
 @c =====================================================================
 @c Each bibliography item has a sort key, so the bibliography can be
 @c sorted in emacs with M-x sort-paragraphs on the region with the items.
@@ -1635,21 +1641,20 @@ about computer arithmetic:
 
 @itemize @bullet
 
+@c Paywalled.
 @item   @c sort-key: Abbott
 Paul H. Abbott and 15 others, @cite{Architecture and software support
 in IBM S/390 Parallel Enterprise Servers for IEEE Floating-Point
 arithmetic}, IBM Journal of Research and Development @b{43}(5/6)
-723--760 (1999),
+723--760 (1999), This article gives a good description of IBM's
-@uref{https://doi.org/10.1147/rd.435.0723}. This article gives
+algorithm for exact decimal-to-binary conversion, complementing
-a good description of IBM's algorithm for exact decimal-to-binary
+earlier ones by Clinger and others.
-conversion, complementing earlier ones by Clinger and others.
 
+@c Paywalled.
 @item   @c sort-key: Beebe
 Nelson H. F. Beebe, @cite{The Mathematical-Function Computation Handbook:
 Programming Using the MathCW Portable Software Library},
-Springer (2017), ISBN 3-319-64109-3 (hardcover), 3-319-64110-7 (e-book)
+Springer (2017).
-(xxxvi + 1114 pages),
-@uref{https://doi.org/10.1007/978-3-319-64110-2}.
 This book describes portable implementations of a large superset
 of the mathematical functions available in many programming
 languages, extended to a future 256-bit format (70 decimal
@@ -1658,21 +1663,23 @@ a substantial portion of the functions described in the famous
 @cite{NIST Handbook of Mathematical Functions}, Cambridge (2018),
 ISBN 0-521-19225-0.
 See
-@uref{https://www.math.utah.edu/pub/mathcw}
+@uref{https://www.math.utah.edu/pub/mathcw/}
 for compilers and libraries.
 
+@c URL ok
 @item   @c sort-key: Clinger-1990
 William D. Clinger, @cite{How to Read Floating Point Numbers
 Accurately},  ACM SIGPLAN Notices @b{25}(6) 92--101 (June 1990),
 @uref{https://doi.org/10.1145/93548.93557}.
 See also the papers by Steele & White.
 
-@item   @c sort-key: Clinger-2004
+@c Paywalled.
-William D. Clinger, @cite{Retrospective: How to read floating
+@c @item   @c sort-key: Clinger-2004
-point numbers accurately}, ACM SIGPLAN Notices @b{39}(4) 360--371 (April 2004),
+@c William D. Clinger, @cite{Retrospective: How to read floating
-@uref{https://doi.acm.org/10.1145/989393.989430}.  Reprint of 1990 paper,
+@c point numbers accurately}, ACM SIGPLAN Notices @b{39}(4) 360--371 (April 2004),
-with additional commentary.
+@c Reprint of 1990 paper, with additional commentary.
 
+@c URL ok
 @item   @c sort-key: Goldberg-1967
 I. Bennett Goldberg, @cite{27  Bits Are Not Enough For 8-Digit Accuracy},
 Communications of the ACM @b{10}(2) 105--106 (February 1967),
@@ -1681,6 +1688,7 @@ and its companions by David Matula, address the base-conversion
 problem, and show that the naive formulas are wrong by one or
 two digits.
 
+@c URL ok
 @item   @c sort-key: Goldberg-1991
 David Goldberg, @cite{What Every Computer Scientist Should Know
 About Floating-Point Arithmetic}, ACM Computing Surveys @b{23}(1)
@@ -1690,6 +1698,7 @@ This paper has been widely distributed, and reissued in vendor
 programming-language documentation.  It is well worth reading,
 and then rereading from time to time.
 
+@c ??? site does not respond, 20 Sep 2022
 @item   @c sort-key: Juffa
 Norbert Juffa and Nelson H. F. Beebe, @cite{A Bibliography of
 Publications on Floating-Point Arithmetic},
@@ -1706,6 +1715,7 @@ Abbott, Clinger, and Steele & White papers cited earlier contain
 pointers to several other important related papers on the
 base-conversion problem.
 
+@c URL ok
 @item   @c sort-key: Kahan
 William Kahan, @cite{Branch Cuts for Complex Elementary Functions, or
 Much Ado About Nothing's Sign Bit}, (1987),
@@ -1724,18 +1734,19 @@ University of California, Berkeley, have gone on to careers in
 academic and industry, spreading the knowledge of how to do
 floating-point arithmetic right.
 
+@c paywalled
 @item   @c sort-key: Knuth
 Donald E. Knuth, @cite{A Simple Program Whose Proof Isn't},
 in @cite{Beauty is our business: a birthday salute to Edsger
 W. Dijkstra}, W. H. J. Feijen, A. J. M. van Gasteren,
 D. Gries, and J. Misra (eds.), Springer (1990), ISBN
-1-4612-8792-8,
+1-4612-8792-8,  This book
-@uref{https://doi.org/10.1007/978-1-4612-4476-9}.  This book
 chapter supplies a correctness proof of the decimal to
 binary, and binary to decimal, conversions in fixed-point
 arithmetic in the TeX typesetting system.  The proof evaded
 its author for a dozen years.
 
+@c URL ok
 @item   @c sort-key: Matula-1968a
 David W. Matula, @cite{In-and-out conversions},
 Communications of the ACM @b{11}(1) 57--50 (January 1968),
@@ -1747,38 +1758,39 @@ Proceedings of the American Mathematical Society @b{19}(3)
 716--723 (June 1968).  See also other papers here by this author,
 and by I. Bennett Goldberg.
 
+@c page is blank without running JS.
 @item   @c sort-key: Matula-1970
 David W. Matula, @cite{A Formalization of Floating-Point Numeric
 Base Conversion}, IEEE Transactions on Computers @b{C-19}(8)
 681--692 (August 1970),
-@uref{https://doi.org/10.1109/T-C.1970.223017}.
 
+@c page is blank without running JS.
 @item   @c sort-key: Muller-2010
 Jean-Michel Muller and eight others, @cite{Handbook of
 Floating-Point Arithmetic}, Birkh@"auser-Boston (2010), ISBN
-0-8176-4704-X (xxiii + 572 pages),
+0-8176-4704-X (xxiii + 572 pages).  This is a
-@uref{https://doi.org/10.1007/978-0-8176-4704-9}.  This is a
 comprehensive treatise from a French team who are among the
 world's greatest experts in floating-point arithmetic, and among
 the most prolific writers of research papers in that field.  They
 have much to teach, and their book deserves a place on the
 shelves of every serious numerical programmer.
 
+@c paywalled
 @item   @c sort-key: Muller-2018
 Jean-Michel Muller and eight others, @cite{Handbook of
 Floating-Point Arithmetic}, Second edition, Birkh@"auser-Boston (2018), ISBN
-3-319-76525-6 (xxv + 627 pages),
+3-319-76525-6 (xxv + 627 pages).  This is a new
-@uref{https://doi.org/10.1007/978-3-319-76526-6}.  This is a new
 edition of the preceding entry.
 
+@c URL given is obsolete
 @item   @c sort-key: Overton
 Michael Overton, @cite{Numerical Computing with IEEE Floating
 Point Arithmetic, Including One Theorem, One Rule of Thumb, and
 One Hundred and One Exercises}, SIAM (2001), ISBN 0-89871-482-6
 (xiv + 104 pages),
-@uref{https://www.ec-securehost.com/SIAM/ot76.html}.
 This is a small volume that can be covered in a few hours.
 
+@c URL ok
 @item   @c sort-key: Steele-1990
 Guy L. Steele Jr. and Jon L. White, @cite{How to Print
 Floating-Point Numbers Accurately}, ACM SIGPLAN Notices
@@ -1786,11 +1798,11 @@ Floating-Point Numbers Accurately}, ACM SIGPLAN Notices
 @uref{https://doi.org/10.1145/93548.93559}.
 See also the papers by Clinger.
 
+@c paywalled
 @item   @c sort-key: Steele-2004
 Guy L. Steele Jr. and Jon L. White, @cite{Retrospective: How to
 Print Floating-Point Numbers Accurately}, ACM SIGPLAN Notices
-@b{39}(4) 372--389 (April 2004),
+@b{39}(4) 372--389 (April 2004),  Reprint of 1990
-@uref{https://doi.acm.org/10.1145/989393.989431}.  Reprint of 1990
 paper, with additional commentary.
 
 @item   @c sort-key: Sterbenz