Existence, uniqueness and a priori estimates for a non linear   integro-differential equation
  The paper deals with the explicit calculus and the properties of the fundamental solution K of a parabolic operator related to a semilinear equation that models reaction diffusion systems with excitable kinetics. The initial value problem in all of the space is analyzed together with continuous dependence and a priori estimates of the solution. These estimates show that the asymptotic behavior is determined by the reaction mechanism. Moreover it's possible a rigorous singular perturbation analysis for discussing travelling waves with their characteristic times. 
M.De Angelis, P. Renno
math-ph cond-mat.dis-nn cond-mat.supr-con math.MP q-bio.NC