Ramunas Girdziusas Jorma Laaksonen Gaussian Process Regression with Fluid Hyperpriors. 567-572 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3316&spage=567 2004 conf/iconip/2004 ICONIP db/conf/iconip/iconip2004.html#GirdziusasL04