Nonlinear systems with singular vector ϕϕ-Laplacian under the Hartman-type condition

Based on a continuation principle, we give some existence results of solutions for the nonlinear problem (ϕ(u′))′=f(t,u),(ϕ(u′))′=f(t,u),u(0)=u(T),u′(0)=u′(T) involving singular vector ϕϕ-Laplacian with ϕ:B(a)→RN(0