bibtype;author;title;journal;year;month;editor;publisher;booktitle;address;chapter;edition;note;pages;series;volume;institution;organization;school;type;doi; article;N. Schuch, M. M. Wolf, F. Verstraete, J. I. Cirac;The computational complexity of PEPS;Physical Review Letters;2007;0;;;;;;;http://arxiv.org/abs/quant-ph/0611050;140506;;;;;;;