Nonlinear eigenvalues and analytic-hypoellipticity /
Yu, Ching-Chau,1966-
American Mathematical Society.
Providence, R.I. : American Mathematical Society,
c1998.
"July 1998, volume 134, number 636 (second of 6 numbers)."
Includes bibliographical references (p. 91-92).
Partial differential operators.
Eigenvalues.
Differential equations, Hypoelliptic.
Asymptotic expansions.