P. Waltman

Perturbation of Two-Dimensional Predator-Prey Equations

H. I. Freedman, P. Waltman, P. Waltman, 1975 .

Radially symmetric solutions of a Monge-Ampère equation arising in a reflector mapping problem

P. Waltman, V. Oliker, 1987 .

Some properties of solutions ofu″+a(t)f(u)=0

P. Waltman, P. Waltman, 1963 .