Learning and inference in hierarchical models with singularities.

Shun-ichi Amari Tomoko Ozeki Hyeyoung Park Learning and inference in hierarchical models with singularities. 34-42 2003 34 Systems and Computers in Japan 7 http://dx.doi.org/10.1002/scj.10353 db/journals/scjapan/scjapan34.html#AmariOP03