Pl. Lions et Pe. Souganidis, FULLY NONLINEAR 2ND-ORDER DEGENERATE ELLIPTIC-EQUATIONS WITH LARGE ZEROTH-ORDER COEFFICIENTS, Indiana University mathematics journal, 42(4), 1993, pp. 1525-1543
We prove the existence of smooth solutions for various classes of full
y nonlinear second-order degenerate elliptic equations with large zero
eth-order coefficients. We also consider some particular systems and w
e indicate how the methods and results can be applied to obtain the ex
istence of, local in time, smooth solutions of the corresponding Cauch
y problems.