  We study the travelling wave problem J\astu - u - cu' + f (u) = 0 in R,
u(-\infty) = 0, u(+\infty) = 1 with an asymmetric kernel J and a monostable
nonlinearity. We prove the existence of a minimal speed, and under certain
hypothesis the uniqueness of the profile for c = 0. For c = 0 we show examples
of nonuniqueness.
