id	keyword
ejpam-6796	− t∫
ejpam-6796	ds t∫
ejpam-6796	a1(s
ejpam-6796	λ2k
ejpam-6796	k a1(s
ejpam-6796	λ2k a1(s
ejpam-6796	problem
ejpam-6796	inverse
ejpam-6796	a1(τ