%0 Journal Article %A Kong, Qingkai %A Wang, Min %T Eigenvalue Approach to Even Order System Periodic Boundary Value Problems %J Canadian mathematical bulletin %D 2013 %P 102-115 %V 56 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-2011-138-3/ %R 10.4153/CMB-2011-138-3 %F 10_4153_CMB_2011_138_3