Taweepol Suesut Vittaya Tipsuwanporn Phongchai Nilas Prapas Remgreun Arjin Numsomran Multi level contract net protocol based on holonic manufacturing system implement to industrial networks. 253-258 2004 RAM http://ieeexplore.ieee.org/xpls/abs_all.jsp?isnumber=30991&arnumber=1438926&count=107&index=44 conf/ram/2004 db/conf/ram/ram2004.html#SuesutTNRN04