1. Symmetry Methods for Differential Equations;Hydon,2000
2. Applied Differential Equation;Spiegel,1967
3. Differential Equation with Applications;Ritger,1968
4. Opere del Conte Jacopo Riccati, Nobile Trevigiano, Tomo I;Riccati,1761
5. Exercices de Calcul Intégral sur Divers Ordres de Transcendantes et Sur Les Quadratures;Legendre,1811