Arreglar referencia [SUTT99] rota

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 .. [SUTT99] Herb Sutter. Exceptional C++: 47 Engineering Puzzles,
    Programming Problems, and Solutions, 1ra edición. Addison-Wesley
-
    Professional, 1999. ISBN 0-201-61562-2.
+
 .. [DNG46407] Oskar Linde. The problem with the D GC. Grupo de noticias
    digitalmars.D, 8 de enero de 2007. `Mensaje número 46407`__.
 __ http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D&article_id=46407