1. Wikipedia. Log-normal distribution.
https://en.wikipedia.org/wiki/Log-normal_distribution
. Accessed 3 Feb 2019.
2. Elassaiss-Schaap J, Heisterkamp SH. Variability as constant coefficient of variation: can we right two decades in error? Abstracts of the Annual Meeting of the Population Approach Group in Europe. 2009.
www.page-meeting.org/?abstract=1508
. Accessed 3 Feb 2019 (Abstract 1508, ISSN 1871-6032).