@incollection{Andreev18,
author = {Irina Andreeva and Alexey Andreev},
title = {Phase Portraits of Cubic Dynamic Systems in a Poincare Circle},
booktitle = {Differential Equations},
publisher = {IntechOpen},
address = {Rijeka},
year = {2018},
editor = {Terry E. Moschandreou},
chapter = {4},
doi = {10.5772/intechopen.75527},
url = {https://doi.org/10.5772/intechopen.75527}
}