Abstract
By proving a lower and an upper bound for Green's function of certain parabolic operators with Lipschitz coefficients in R-n(+) x]0,T[, where R-+(n) ={x=(x(1),...,x(n))is an element of R-n : x(n)>0} and 0 <T <+infinity, we give a characterization of the associated parabolic potentials and we study in a last part the boundary behaviour of these potentials for n=1.