Robert H. G. Helleman

Chaotic behaviour of deterministic systems

G. Iooss, Gérard Iooss, R. Stora, 1983 .

On the stability of periodic orbits of two-dimensional mappings

Tassos Bountis, T. Bountis, Robert H. G. Helleman, 1981 .

On the Iterative Solution of a Stochastic Mapping

Robert H. G. Helleman, 1977 .