@article{article866a83b5,
title   = {Analytic integrability for a class of cone potential Hamiltonian systems},
author = {Moauro, Vinicio and Negrini, Piero and Oliva, Waldyr Muniz},
year = {1991},
doi = {10.1016/0022-0396(91)90161-2},
journal   = {Journal of Differential Equations}
}