Haspelmath, Martin. 1993. The diachronic externalization of inflection. Linguistics 31.2. 279-309.
@article{jacquesestimative-haspelmath93extern,
author = {Haspelmath, Martin},
journal = {Linguistics},
pages = {279-309},
title = {The diachronic externalization of inflection},
volume = {31.2},
year = {1993}
}