Bibliography
Roman, P. 1969. “Symmetry in Physics.” in Proceedings of the Boston Colloquium for the Philosophy of Science 1966/1968, edited by Robert S. Cohen and Marx W. Wartofsky, pp. 363–369. Boston Studies in the Philosophy of Science n. 5. Dordrecht: D. Reidel Publishing Co., doi:10.1007/978-94-010-3378-7.