[ 1] Cabada A, L iz E. Boundary va lue problem s for h igher o rder o rdina ry differential equations w ith impu lses[ J]. Non linear Anal, 1998, 32( 4): 775-786.
[ 2] W e i Z. Per iod ic boundary va lue prob lem for second orde r impulsiv e integro-differential equa tions o f m ixed type in Banach spaces[ J] , JM ath Ana lApp,l 1995, 195( 2): 214-229.
[ 3] Cabada A, N ie to J J, Franco D, et a.l A genera liza tion of the monotone m e thod fo r second orde r per iod ic boundary value problem with impulses at fix ed points[ J]. Dynam Contin D iscrete Impu ls Sy s, 2000, 7( 2) : 145-158.
[ 4] Guo D, L iu X. M ultiple positive solutions of boundary va lue problem s for impulsiv e d ifferen tia l equation [ J]. Non linear Anal,1995, 25( 3): 327-337.
[ 5] Li J, Shen J. Per iodic boundary va lue problem s for second orde r differential equa tions w ith im pulses[ J]. Nonlinear Stud ies,2005, 12( 4): 391-400.
[ 6] K rasnosekiiM A, Zab re iko P P. Geome trica lM e thods of Nonlinea rAnalysis[M ]. New Yo rk: Spr inger-Verlag, 1984.