Chuzo Iwamoto Naoki Hatayama Kenichi Morita Katsunobu Imai Daisuke Wakamatsu Hierarchies of DLOGTIME-Uniform Circuits. 211-222 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3354&spage=211 2004 conf/mcu/2004 MCU db/conf/mcu/mcu2004.html#IwamotoHMIW04