Fri-G-99

@article{Fri-G-99,
title = {Heesch tiles with surround numbers 3 and 4},
author = {Erich Friedman},
journal = {Geombinatorics},
volume = {VIII},
number = {4},
pages = {101--103},
year = {1999},
url = {http://www.stetson.edu/~efriedma/papers/heesch.pdf}}

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