by Gray, John W [author.] | SpringerLink (Online service).
by American Mathematical Society. Meeting (89th : 1983 : Denver, Colo.) | Gray, John W. (John Walker), 1931-.
by AMS-IMS-SIAM Joint Summer Research Conference in the Mathematical Sciences on Categories in Computer Science and Logic (1987 : University of Colorado, Boulder) | Gray, John W. (John Walker), 1931- | �S�cedrov, Andrej, 1955- | National Science Foundation.