Morphology of prostate cancer : the effects of multifocality on histological frage, tumor volume and capsule penetrationMILLIER, G. J; CYGAN, J. M.The Journal of urology. 1994, Vol 152, Num 5, pp 1709-1713, issn 0022-5347, 2Conference Paper

Global regularity on 3-dimensional solvmanifoldsCYGAN, J. M; RICHARDSON, L. F.Transactions of the American Mathematical Society. 1992, Vol 329, Num 2, pp 473-488, issn 0002-9947Article

Globally hypoelliptic systems of vector fields on nilmanifoldsCYGAN, J. M; RICHARDSON, L. F.Journal of functional analysis. 1988, Vol 77, Num 2, pp 364-371, issn 0022-1236Article