Language Spread: Studies in Diffusion and Social Change ed. Robert L. Cooper Indiana University Press, Bloomington, in cooperation with the Center for Applied Linguistics, Washington, D.C. 1982. Pp. 360.
No takes yet. Share an insight, caveat, or question.
Björn H. Hernudd (1985) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: