Hiroyuki Sato Takafumi Nakagawa Kiyoshi Yoda Katsuto Nakajima Hidenobu Sakamoto Masahiro Endo Speed-up of radiation treatment planning using a workstation cluster. 96-106 2004 35 Systems and Computers in Japan 8 http://dx.doi.org/10.1002/scj.10277 db/journals/scjapan/scjapan35.html#SatoNYNSE04