Freeman, W., & Watts, J. W. (1939). An interpretation of the functions of the frontal lobe: Based upon observations in forty-eight cases of prefrontal lobotomy. The Yale Journal of Biology and Medicine, 11(5), 527–539, p. 537.
Strub, R. L. (1989). Frontal lobe syndrome in a patient with bilateral globus pallidus lesions. Archives of Neurology, 46(9), 1024–1027.