I know someone whose work is cited in the "Try and" paper, and she asked me to pass this along in response to your comment:

> Feel free to let djtango know that the paper they're looking for is Bergen (2001), "Nativization processes in L1 Esperanto". It's a minor classic and deserves any attention it gets!

I searched for the title, and this PDF was among the top matches: https://pages.ucsd.edu/~bkbergen/papers/NEJCL.pdf