9Terpstra C. The immunity against challenge with swine fevervirus of piglets from SOWS vaccinated with C-surain vaccine. Tijdschrift Voor Diergeneeskundef Amsterdam, 1977,102:1293-1298.
10Terpstra C.The immunity against challenge with swine fever virus of piglets from sows vaccinated with C-strain vaccine[J].Tijdschrift Voor Diergeneeskunde,1977,102:1293-1298.