References
- Ruben , H. 1974a . A new result on the probability integral of noncentral chi-square with even degrees of freedom . Commun. Statist. , 3 : 473 – 476 .
- Ruben , H. 1974b . Noncentral chi-square and gamma revisited . Commun. Statist. , 3 : 607 – 633 .