A.S. ANAND, W.G. HOBKSTRA, N.L. FIRST. 1967,
J.Anim,Sci.,, 26, 171-173.

R. BOUTBRS, E. ESNAULT, R. ORTAVANT, G.W.SALISBURY,
1967, Nature, 213:181-182.

R. BOUTBRS, C. BESNAULT, G. SALISBURY, R. ORTAVANT,
1967, J.Reprod, Fertil., 14:355-363,

J. FPULKA, H.H. KOBFOED-JOHNSEN, 1966, Aarsberetn,
Inst.f. Sterilitetsforskn., p.213-225,

B.L. GLEDHILL, M.P. GLBDHILL, R.RIGLER, N.R.RINGERTZ,
1966, Bxptl.Cell.Res., 41:652-665,

H.H. KOEFOED-JOHNSEBN, 1964, Aarsberetn, Inst, f.
Sterilitetsforskn,, p. 33-43.

C. NORMAN, 1964, Vth Int, Congress Anim. Reprod.
Artif, Ins., vol. IV:269-275.

G.W. SALISBURY, W.J.BIRGE, L.DE LA TORRE, J.R,LODGE
1961, J. Biophys, Biochem. Cytol., 10:353-359,

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