TY - BOOK TI - Nonlinear partial differential equations of second order T2 - Translations of mathematical monographs, SN - 0821845543 (alk. paper) PY - 1991/// CY - Providence, R.I. PB - American Mathematical Society N1 - Translation of: Fei xian xing er jie pian wei fen fang cheng. | Original Chinese title on verso of t.p ER -