@inproceedings{bridges2011:118, author = {Jouko Koskinen}, title = {Unusual Tilings and Transformations}, pages = {539--542}, booktitle = {Proceedings of Bridges 2011: Mathematics, Music, Art, Architecture, Culture}, year = {2011}, editor = {Reza Sarhangi and Carlo H. S\'{e}quin}, isbn = {978-0-9846042-6-5}, issn = {1099-6702}, publisher = {Tessellations Publishing} }