Klaus Greff Antti Rasmus Mathias Berglund Tele Hotloo Hao Harri Valpola Jürgen Schmidhuber 4484-4492 2016 NIPS https://proceedings.neurips.cc/paper/2016/hash/01eee509ee2f68dc6014898c309e86bf-Abstract.html http://papers.nips.cc/paper/6067-tagger-deep-unsupervised-perceptual-grouping conf/nips/2016 db/conf/nips/nips2016.html#GreffRBHVS16