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...