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- [8] EARLY-PREGNANCY FACTOR (EPF) - POSSIBLE BIOLOGICAL AND CLINICAL SIGNIFICANCY DEUTSCHE TIERARZTLICHE WOCHENSCHRIFT, 1982, 89 (06): : 253 - 258
- [10] THE EARLY-PREGNANCY FACTOR (EPF) - AN ESTABLISHED PHENOMENON FOR THE DETECTION OF FERTILIZATION HUMAN REPRODUCTION /: CURRENT STATUS / FUTURE PROSPECT, 1988, 768 : 477 - 479