Ertek, Çetin Nordheim equation according to P1-approximation Ç. Ertek, Ş. Gencay, Y. Gürsu - İstanbul ÇNAEM 1969 - 8 y. 28 cm. - ÇNAEM Raporlar 73 . Subjects--Topical Terms: Reactors--Diffusion theory. Dewey Class. No.: 621.4831 ERT 1969