Differential equations /
Ford, Lester R.
Differential equations / Lester R Ford. - 2nd.ed. - New York : McGraw-hill, c1955. - 291 p.
QA371 / .R67
Differential equations / Lester R Ford. - 2nd.ed. - New York : McGraw-hill, c1955. - 291 p.
QA371 / .R67