共 16 条
[3]
DONE JT, 1968, VET REC, V82, P64
[4]
PREGNANCY DIAGNOSIS AND DETECTION OF FOETAL LIFE IN SHEEP AND PIGS BY AN ULTRASONIC METHOD
[J].
BRITISH VETERINARY JOURNAL,
1968, 124 (06)
:239-+
[5]
HORZAK F, 1968, ACTA U AGR, V16, P723
[6]
HOWERY DH, 1954, CANCER, V7, P354
[7]
KICHUCHI T, 1957, J ACOUST SOC AM, V29, P824
[9]
LINDAHL IL, 1972, J ANIM SCI, V35, P1120
[10]
MACVICAR J, 1963, J OBSTET GYN BR COMM, V70, P387