Carl G. Hempel. Fundamentals of concept formation in empirical science. International encyclopedia of unified science, vol. 2 no. 7. The University of Chicago Press, Chicago1952, iii + 93 pp.
1952 ◽
Vol 3
(11)
◽
pp. 286-286
1957 ◽
Vol 8
(31)
◽
pp. 256-257