More Groups
Fewer Groups
More People
Fewer People
More Years
Fewer Years
Tan, J. C.; Nocka, K.; Ray, P.; Traktman, P.; Besmer, P. Science (1990)
Emmel, E. A.; Vekweij, C. L.; Durand, D. B.; Higgins, K. M.; Lacy, E.; Crabtree, G. R. Science (1989)