A. Kolmogorov, I. Petrovskii, and N. Piscunov. Selected Works of A.N. Kolmogorov: Mathematics and mechanics, volume 25 of Mathematics and its Applications (Soviet Series), Springer Netherlands, (1991)
D. Aronson, and H. Weinberger. Partial differential equations and related topics (Program, Tulane Univ., New Orleans, La., 1974), Lecture Notes in Math., Vol. 446, Springer, Berlin, (1975)
D. Mollison. Proceedings of the Sixth Berkeley Symposium on Mathematical Statistics and Probability (Univ. California, Berkeley, Calif., 1970/1971), Vol. III: Probability theory, page 579--614. Berkeley, Calif., Univ. California Press, (1972)
C. Mueller, and R. Sowers. Stochastic analysis (Ithaca, NY, 1993), volume 57 of Proc. Sympos. Pure Math., Amer. Math. Soc., Providence, RI, Finally, T. Shiga has pointed out that there is a dual process for (1.4),
which is a system of branching Brownian motions, in which particles
coalesce at a Poisson rate, measured according to the local time beween
pairs of particles. We do not give a more precise description..(1995)
A. Kolmogorov. Mathematics and its Applications (Soviet Series) Kluwer Academic Publishers Group, Dordrecht, (1991)Mathematics and mechanics, With commentaries by V. I. Arnol\cprimed, V. A. Skvortsov, P. L. Ul\cprimeyanov et al, Translated from the Russian original by V. M. Volosov, Edited and with a preface, foreword and brief biography by V. M. Tikhomirov.