Epstein, G.L.Clark, William2023-03-281990Epstein, G.L. & Clark, W.C. 1990. "2 Plus 2." Science 248, no. 4960: 1174.https://nrs.harvard.edu/URN-3:HUL.INSTREPOS:37374702en-US2 Plus 2Journal Article2023-03-28Epstein, G.L. & Clark, W.C. 1990, "2 Plus 2", Science, vol. 248, no. 4960, pp. 1174.