Since you wanted solid citations, and what better from a book, I went searching through Google books and I collected the following :

Perl Cookbook 2nd ed (Page 408)

Beyond Java (page 57)

Beginning VB 2008: From Novice to Professional (page 66)

Practical Distributed Processing (Page 156)

In reply to Re^2: Strong typing and Type Safety.A multilanguage approach by nikosv
in thread Strong typing and Type Safety.A multilanguage approach by nikosv

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