METHOD OF PREPARING PREPARATION BASED ON VIRUS-BACTERIAL STRAINS FROM LOCAL FOCUS FOR PREPARING MIXED VACCINE OR POLYVALENT HYPERIMMUNE SERUM AGAINST CATTLE DISEASE von EVTIN N.K, RYZHIKOV A.B, KOLESNIKOVA N.G, P'JANKOV O.V, P'JANKOVA O.G, SERGEEV A.N, GREKHOVA G.P, BULYCHEV L.E, KOTLJAROV L.A

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