Perera, Danstan උසස් පෙළ සංයුක්ත ගණිතය - 1 = usas peLa sanyuktha gaNithya-1: SHudhDHa gaNithaya saralava idhiripathkiriimaki - Dehiwala : Gihan bookshop, 2007. - vi,403p.; 22cm ISBN: 978-955-593-355-1 Subjects--Topical Terms: Pure MathematicsCombined Mathematics Dewey Class. No.: 511.6 / PER