@techreport{6764, title = {Sparse nonnegative matrix approximation: new formulations and algorithms}, author = {Tandon, R. and Sra, S.}, number = {193}, organization = {Max-Planck-Gesellschaft}, institution = {Max Planck Institute for Biological Cybernetics, Tübingen, Germany}, school = {Biologische Kybernetik}, month = sep, year = {2010}, doi = {}, month_numeric = {9} }