R. L. Kowalski

发表

G. Clemens, R. Hartnagel, V. Jasty, 1984, Veterinary pathology.

J. Quiring, B. Phillips, R. Hartnagel, 1976, The American Journal of Digestive Diseases.

B. Phillips, R. Hartnagel, P. Kraus, 1971, Toxicology and applied pharmacology.

G. Clemens, R. Hartnagel, V. Jasty, 1986, Laboratory animal science.