Hou, W. S. and othersW. S. and othersHou2011-07-202018-06-282011-07-202018-06-282008http://ntur.lib.ntu.edu.tw//handle/246246/236214en-USHigh-statistics measurement of neutral-pion pair production in two-photon collisionshttp://ntur.lib.ntu.edu.tw/bitstream/246246/236214/-1/51.pdf