An elementary treatise on the integral calculus: containing applications to plane curves and surfaces, and also a chapter on the calculus of variations, with numerous examples./ Williamson, Benjamin. Calculus, Integral. Calculus of variations. 517.3 WIE New York, Longmans, Green and Co., 1880. 1880. 1880 Text 1 online resource (xviii, 375 p.) eng