Akhil R. Garg Basabi Bhaumik Klaus Obermayer Development of a Simple Cell Receptive Field Structure: A Model Based on Hetero-synaptic Interactions. 64-69 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3316&spage=64 2004 conf/iconip/2004 ICONIP db/conf/iconip/iconip2004.html#GargBO04