R Natarajan

Mixed Models: Modelling Covariance Structure in the Analysis of Repeated Measures Data

R C Littell, R. Natarajan, J. Pendergast, 2005 .

A computer program for sample size and power calculations in the design of multi-arm and factorial clinical trials with survival time endpoints.

B W Turnbull, L C Clark, B. Turnbull, 1996, Computer methods and programs in biomedicine.