1. Moores, D. F. in Language Perspectives (eds Schiefelbusch, R. L. & Lloyd, L. L.) 377–878 (University Park, Baltimore, (1974)).
2. Tervoort, B. T. Esoteric symbolism in the communication behavior of young deaf children. Am. Ann. Deaf 106, 436–480 (1961).
3. Fant, L. Ameslan (National Association of the Deaf, Silver Springs, MD, (1972)).
4. Goldin-Meadow, S. & Feldman, H. The development of language-like communication without a language model. Science 197, 401–403 (1977).
5. Goldin-Meadow, S., Mylander, C. & Butcher, C. The resilience of combinatorial structure at the word level: morphology in self-styled gesture systems. Cognition 56, 195–262 (1995).