@inproceedings{bridges2008:29, author = {Roelofs, Rinus}, title = {Connected Holes}, pages = {29--38}, booktitle = {Bridges Leeuwarden: Mathematics, Music, Art, Architecture, Culture}, year = {2008}, editor = {Sarhangi, Reza and S\'{e}quin, Carlo H.}, isbn = {9780966520194}, issn = {1099-6702}, publisher = {Tarquin Publications}, address = {London}, url = {http://archive.bridgesmathart.org/2008/bridges2008-29.html} }