1. Ali MM, Pal M, Woo J (2007) On the ratio of inverted gamma variates. Austrian J Stat 36:153–159
2. Bowman KO, Shenton LR, Gailey PC (1998) Distribution of the ratio of gamma variates. Comm Stat Simul Comput 27(1):1–19
3. Byrd RH, Lu P, Nocedal J, Zhu C (1995) A limited memory algorithm for bound constrained optimization. SIAM J Sci Comput 16:11901208
4. Carnell R (2009) triangle: provides the standard distribution functions for the triangle distribution. R package version 5
5. Delignette-Muller ML, Pouillot R, Denis J-B, Dutang C (2010) fitdistrplus: help to fit of a parametric distribution to non-censored or censored data.