On the integrable rational Abel differential equations

In Cheb-Terrab and Roche (Comput Phys Commun 130(1-2):204-231, 2000) a classification of the Abel equations known as solvable in the literature was presented. In this paper, we show that all the integrable rational Abel differential equations that appear in Cheb-Terrab and Roche (Comput Phys Commun 130(1-2):204-231, 2000) and consequently in Cheb-Terrab and Roche (Eur J Appl Math 14(2):217-229, 2003) can be reduced to a Riccati differential equation or to a first-order linear differential equation through a change with a rational map. The change is given explicitly for each class. Moreover, we have found a unified way to find the rational map from the knowledge of the explicitly first integral.