Impact of Programming Language Fragmentation on Developer Productivity. International Journal of Open Source Software and Processes. 2010;2(2):41 - 61. .
Language entropy: A metric for characterization of author programming language distribution. In 4th Workshop on Public Data about Software Development (WoPDaSD 2009). 2009. LanguageEntropy-JonathanKrein.pdf (895.29 KB) .