Hungarian problem book IV/ translated and edited by Robert Barrington Leigh and Andy Liu. - [Washington, DC]: Mathematical Association of America, c2011. - xv, 115 p.: ill.; 23 cm. - MAA problem books series . - MAA problem books series. . ISBN: 0883858312 9780883858318 LCCN: 2011403204 Subjects--Topical Terms: Mathematics--Functions of real variables. Dewey Class. No.: 510.76 / H936