Hoyt, R. F., Withrow, S. J.: Oral malignancy in the dog, J Am Anim Hosp Assoc, 20, 83-92(1984)
Chorost, M. I., Lee, M. C., Yeoh, C. B., Molina, M., Ghosh, B. C.: Unknown primary, J Surg Oncol, 87, 191-203(2004)
Giuliano, A. E., Moseley, H. S., Morton, D. L.: Clinical aspects of unknown primary melanoma, Ann Surg, 191, 98-104(1980)
Morrison, W. B., Hahn, K. A. Cancers of unknown primary origin, Proceedings of the American College of Veterinary Internal Medicine, 8: 411-413(1990)
Ramos-Vara, J. A., Beissenherz, M. E., Miller, M. A., Johnson, G. C., Pace, L. W., Fard, A., Kottler, S. J.: Retrospective study of 338 canine oral melanomas with clinical, histologic, and immunohistochemical review of 129 cases, Vet Pathol, 37, 597-608(2000)