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Five years ago, at the Mathematical Institute, I met a 15 years old girl Ana Kozomara. She came there with the question:

"Where to find the derivation of 17 wallpaper groups?"

"Well... see in Weyl, Martin, Armstrong..."

Now, we have the new answer to this question: in her graduate work completed in 1998 at the Mathematical Gimnazium in Belgrade. After that, she continued the studies of the Mathematics at the University of Paris. Please, remember her name...

Slavik Jablan