@incollection{Bengio+al-ssl-2006, author = {Yoshua Bengio and Olivier Delalleau and Nicolas {Le Roux}}, title = {Label Propagation and Quadratic Criterion}, booktitle = {Semi-Supervised Learning}, editor = {Olivier Chapelle and Bernhard Sch{\"o}lkopf and Alexander Zien}, pages = {193--216}, year = 2006, publisher = {{MIT} Press} }