1. Baillon, J.-B., Clément, Ph., Greven, A., den Hollander, F.: A variational approach to branching random walk in random environment. Ann. Probab. (to appear)
2. Baillon, J.-B., Clément, Ph., Greven, A., den Hollander, F.: On a variational problem for an infinite particle system in a random medium (preprint, 1991)
3. Bramson, M., Durrett, R., Schonmann, R.H.: The contact process in a random environment. Ann. Probab.19, 960–983 (1990)
4. Chen, D., Liggett, T.M.: Finite reversible nearest particle systems in inhomogeneous and random environments (preprint, 1989)
5. Dawson, D., Fleischmann, K.: On spatially homogeneous branching processes in a random environment. Math. Nachr.113, 249–257 (1983)