Tsang, Jia-Sun and Roland H. Cunningham. "Some Improvements in the Study of Cross Sections." Journal of the American Institute for Conservation 30/2 (1991): 163-177.

Tsang, Jia-Sun and Roland H. Cunningham. "Some Improvements in the Study of Cross Sections." Journal of the American Institute for Conservation 30/2 (1991): 163-177.