Volume 8 (1981) no. 4

Table of contents

Internal waves in fluids with rapidly varying density
p. 513-573
A class of pseudo differential operators with multiple non-involutive characteristics
p. 575-603
Remarks about Signorini's problem in linear elasticity
p. 605-645
On nontrivial solutions of a semilinear wave equation
p. 647-657
Continuity of solutions of the porous media equation
p. 659-675