College algebra : Palomar college / Richard N. Aufmann, Vernon C. Barker, Richard D. Nation. - Boston [et al.] : Houghton Mifflin comp., [1990]. - ix, 481, [72] p. : fig. ; 26 cm.см.. - (College algebra a. trigonometry). - ISBN 0-395-38097-9[MFN: 5502]