Hempel CG, Oppenheim P (1948). "Studies in the Logic of Explanation". Philosophy of Science. XV (2): 135–175. CiteSeerX 10.1.1.294.3693. doi:10.1086/286983. S2CID 16924146. /wiki/CiteSeerX_(identifier)
Hempel CG, Oppenheim P (1948). "Studies in the Logic of Explanation". Philosophy of Science. XV (2): 135–175. CiteSeerX 10.1.1.294.3693. doi:10.1086/286983. S2CID 16924146. /wiki/CiteSeerX_(identifier)
Hempel CG, Oppenheim P (1948). "Studies in the Logic of Explanation". Philosophy of Science. XV (2): 135–175. CiteSeerX 10.1.1.294.3693. doi:10.1086/286983. S2CID 16924146. /wiki/CiteSeerX_(identifier)