Flett, T. M. Differential analysis : differentiation, differential equations, and differential inequalities / T. M. Flett. - Cambridge ; New York : Cambridge University Press, 1980. - vii, 359 p. : ill. ; 24 cm. Includes indexes. Bibliography: p. [339]-350. ISBN: 0521224209 Subjects--Topical Terms: Differential calculus.Differential equations.Differential inequalities.