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“Snapshot.” Accessed December 12, 2016. https://books.google.fr/books?hl=en&lr=&id=wkrLCQAAQBAJ&oi=fnd&pg=PA82&dq=info:fLRrQYM09LUJ:scholar.google.com&ots=oo20DgIBUv&sig=j1Zw8f5CLD1fDE8d32W25jWmO1U&redir_esc=y#v=onepage&q&f=false.