Involvement of CD8 <sup>+</sup> T Cells in Delayed-type Hypersensitivity Responses against Bovine Leukemia Virus (BLV) Induced in Sheep Vaccinated with Recombinant Vaccinia Virus Expressing BLV Envelope GlycoproteinKosuke Okada, Yoji Ikawa, K. Ohishi et al.|Veterinary Pathology|1993Cited by 13