Dobrushkin, Vladimir A. Applied differential equations : the primary course / Vladimir A. Dobrushkin. - Boca Raton : CRC Press, 2015. - xvi, 713 p. : ill. ; 25 cm. - Textbooks in mathematics. . ISBN: 9781439851043 (hbk.) Subjects--Topical Terms: Differential equations.Legendre's polynomials.Bessel functions.