Hartmut Burmeister

The pragmatics of formulas in L2 learner speech: Use and development

Jens Bahns, Thomas Vogel, J. Bahns, 1986 .

Variability in Second Language Acquisition: Proceedings of the Tenth Meeting of the Second Language Research Forum

Hartmut Burmeister, Timothy J. Riney, Patricia Rounds, 1991 .