1. Abramowitz, M. and I.E. Stegun, Handbook of Mathematical Functions (National Bureau of Standards, Washington, DC).
2. Statistical Analysis of Reliability and Life-Testing Models;Bain,1978
3. A continuous bivariate exponential extension;Block;J. Amer. Statist. Assoc.,1974
4. A bivariate extension of exponential distribution;Freund;J. Amer. Statist. Assoc.,1961
5. Paired observations from a survival distribution;Gross;Biometrics,1981