@Article{Liu2011,
author = "Liu, Xinggui and Ren, Yaping and Li, Yongkun",
title = "Four positive periodic solutions of a discrete time Lotka-Volterra competitive system with harvesting terms",
journal = "Opuscula Math.",
year = "2011",
volume = "31",
number = "2",
pages = "257--267",
doi = "http://dx.doi.org/10.7494/OpMath.2011.31.2.257",
url = "http://dx.doi.org/10.7494/OpMath.2011.31.2.257",
abstract = "In this paper, by using Mawhin's continuation theorem of coincidence degree theory, we establish the existence of at least four positive periodic solutions for a discrete time Lotka-Volterra competitive system with harvesting terms. An example is given to illustrate the effectiveness of our results.",
keywords = "discrete systems, Lotka-Volterra competitive models, coincidence degree, harvesting terms",
issn = "1232-9274"
}