1. Aitchison J (1955) On the distribution of a positive random variable having a discrete probability mass at the origin. J Am Stat Assoc 50:901–908
2. Charalambides CH (1974) Minimum variance unbiased estimation for a class of left truncated distributions. Sankhya Indian J Stat Ser A 36:392–418
3. Gupta RC (1977) Minimum variance unbiased estimation in modified power series distribution and some of its applications. Commun Stat Theory Methods 6(10):977–991
4. http://www.cbioportal.org/study?id=brca_metabric#clinical
. Accessed 24 Jan 2018
5. Jani PN (1977) Minimum variance unbiased estimation for some left-truncated modified power series distributions. Sankhya Indian J Stat Ser B 39:258–278