Lehmann 1973

Lehmann, Winfred P. 1973. A structural principle of languages and its implications. Language 49. 47-66.

@article{jacquesestimative-lehmann73structural,
  author  = {Lehmann, Winfred P.},
  journal = {Language},
  pages   = {47-66},
  title   = {A structural principle of languages and its implications},
  volume  = {49},
  year    = {1973}
}