http://www.oswego.edu/~baloglou/103/isometrica.html -- freely accessible to all
[Mostly teaching-oriented (border & wallpaper patterns, including two-colored types), but also presenting a
novel approach and classification (based primarily on compositions and images of isometries investigated in
a purely geometrical context); a related page is http://www.oswego.edu/~baloglou/103/seventeen.html ]
For more information please e-mail baloglou AT oswego.edu
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