PENGARUH SUHU PENYIMPANAN TERHADAP TITER IIEEMAGLUTINASI VIRUS INFECTIOUS BRONCHITIS GALUR MASSACHUSETTS H-120 = EFFECT OF THE TEMPERATUR STORAGE FOR HEMAGLLUTINATION TITER OF INFECTIOUS BRONCHITIS VIRUS MASSACHUSETTS - Perpustakaan UGM, i-lib ([Yogyakarta] : Universitas Gadjah Mada, 2002)