Elementary differential equations.
Kells, Lyman M. 1888-
Elementary differential equations. - 3d ed. - New York, McGraw-Hill Book Co., 1947. - xiv, 312 p. diagrs. 21 cm.
Differential equations.
QA371 / .K4 1947
Elementary differential equations. - 3d ed. - New York, McGraw-Hill Book Co., 1947. - xiv, 312 p. diagrs. 21 cm.
Differential equations.
QA371 / .K4 1947