@inproceedings{inproceedings198b7f49,
title   = {Attractive central forces may yield Liapunov instability},
author = {Zampieri, Gaetano and Barone Netto, Angelo},
year = {1986},
publisher = {Universidad Simon Bolivar},
booktitle   = {Escuela Latinoamericana de Matematicas - ELAM}
}