@article{GDZPPN002541386,
title = {Periodic Solutions Of Perioically Harvested Lotka-Volterra Systems.},
journal = {Revista colombiana de matematicas},
volume = {21},
year = {1987},
pages = {337-345},
zbl = {0662.92017},
url = {http://dml.mathdoc.fr/item/GDZPPN002541386}
}
Hausrath, Alan R.; Manasevich, Raul F. Periodic Solutions Of Perioically Harvested Lotka-Volterra Systems.. Revista colombiana de matematicas, Tome 21 (1987) pp. 337-345. http://gdmltest.u-ga.fr/item/GDZPPN002541386/