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[2]
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[3]
*BOSTON ICE CO, 1877, POTTER, VCASE
[4]
BUCHANAN, 1970, MACH INTELLIGENCE, V5, P253
[5]
CHURCHMAN, 1969, BRIT J PHIL SCI, V20, P311
[6]
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[7]
COLBY, 1967, MATH BIOSCI, V1, P1
[8]
DENNIS, 1965, MULL, P131
[9]
ELDRIDGE, 1965, MODERN USES LOGIC LA, P129
[10]
ELDRIDGE, 1963, LAW CONTEMP PROB, V28, P78

