Pathak, A.Krishnagopal, S.2015-04-152015-04-152014Physical Review Special Topics, 2014. Vol. 17 (8): Article no. 080703http://hdl.handle.net/123456789/107704662 bytestext/htmlenResonator stabilityhigher-order modesfree-electron laser oscillatorsThree-dimensional simulation codes GENESIS and OPCResonator stability and higher-order modes in free-electron laser oscillatorsArticle