@article{articleb6707f9c,
title   = {Oscillating and periodic solutions of equations of type 'X 2 PONTOS' + 'F IND.1' (x) 'X PONTO' + 'F IND.2' (x) 'X PONTO POT.2' + g (x) = 0},
author = {Guidorizzi, Hamilton L.},
year = {1993},
doi = {10.1006/jmaa.1993.1197},
journal   = {Journal of Mathematical Analysis and Its Applications}
}