Lieberman, P. , Kako, E. T. , Friedman, J. , Tajchman, G. , Feldman, L. S. , and Jimenez, E. B. (1992) Speech production, syntax comprehension, and cognitive deficits in Parkinson's disease. Brain and Language , 43:169--189.

Lieberman, P., Kako, E. T., Friedman, J., Tajchman, G., Feldman, L. S., and Jimenez, E. B. (1992) Speech production, syntax comprehension, and cognitive deficits in Parkinson's disease. Brain and Language, 43:169--189.

Lieberman,Protopapas,Reed,Youngs,Kanki, Cognitive defects at altitude, 1994	::	1
Lieberman, On the nature and evolution of the neural bases of human language, 2002	::	4