@article{hennig13, title = {Quasi-Newton Methods: A New Direction}, author = {Hennig, Philipp and Kiefel, Martin}, journal = {Journal of Machine Learning Research}, volume = {14}, number = {1}, pages = {843--865}, month = mar, year = {2013}, doi = {}, url = {http://www.jmlr.org/papers/volume14/hennig13a/hennig13a.pdf}, month_numeric = {3} }