My Lingua::EN::Sentence Perl module was mentioned in two books, according to google book search. One of them is Advanced Perl Programming (the second edition by Simon Cozens) and the other is Le Poids des mots: : JADT 2004.
According to a search in google scholar, there are dozens of academic papers that report usage of the module.
The above evidence agrees with the dozens of emails that I got from various commercial companies, researchers, research institutes and individuals that reports using the module and were inquiring about it.
The only references to the Hebrew version of the same module, Lingua::HE::Sentence are from my own research papers.