Update some references.

[ginac.git] / doc / tutorial / ginac.texi

diff --git a/doc/tutorial/ginac.texi b/doc/tutorial/ginac.texi
index 520a13dfb1f47c303c5014fd32de518dbecbc7a5..17080bc12fed595d3abd1aa2d46ccdd893e3c01d 100644 (file)
--- a/doc/tutorial/ginac.texi
+++ b/doc/tutorial/ginac.texi
@@ -4855,7 +4855,7 @@ presented this would be impractical.
 One solution to this dilemma is the @dfn{Visitor} design pattern,
 which is implemented in GiNaC (actually, Robert Martin's Acyclic Visitor
 variation, described in detail in
-@uref{http://objectmentor.com/publications/acv.pdf}). Instead of adding
+@uref{https://condor.depaul.edu/dmumaugh/OOT/Design-Principles/acv.pdf}). Instead of adding
 virtual functions to the class hierarchy to implement operations, GiNaC
 provides a single "bouncing" method @code{accept()} that takes an instance
 of a special @code{visitor} class and redirects execution to the one
@@ -6226,7 +6226,7 @@ of @math{E_{k,N,a,b,K}(\tau)}, @math{h_{k,N,r,s}(\tau)} or @math{P} to the speci
 Useful publications:
 
 @cite{Numerical evaluation of iterated integrals related to elliptic Feynman integrals}, 
-M.Walden, S.Weinzierl, arXiv:2010.xxxxx
+M.Walden, S.Weinzierl, arXiv:2010.05271
 
 @node Complex expressions, Solving linear systems of equations, Iterated integrals, Methods and functions
 @c    node-name, next, previous, up
@@ -8663,9 +8663,9 @@ inserted.  But it may be useful to remember that this is not what
 happens.  Knowing this will enable you to write much more efficient
 code.  If you still have an uncertain feeling with copy-on-write
 semantics, we recommend you have a look at the
-@uref{http://www.parashift.com/c++-faq-lite/, C++-FAQ lite} by
-Marshall Cline.  Chapter 16 covers this issue and presents an
-implementation which is pretty close to the one in GiNaC.
+@uref{https://isocpp.org/faq, C++-FAQ's} chapter on memory management.
+It covers this issue and presents an implementation which is pretty
+close to the one in GiNaC.
 
 
 @node Internal representation of products and sums, Package tools, Expressions are reference counted, Internal structures