Lopez, Velazquez Gustavo Partial differential equations of first order and their applications to physics - Singapore World scientific 1999 - 116 p ISBN: 9789810237462 Subjects--Topical Terms: Mathematics LC Class. No.: 515.353 LOP 1999 Dewey Class. No.: 515.353 LOP 1999 National Library of Medicine Call No.: 515.353 LOP 1999