by Arras, C., Fescharek, R., Gregersen, J.P.
Published in The Lancet (British edition) (11.05.1996)

by Gregersen, J.P., Wege, H., Preiss, L., Jentsch, K.D.
Published in Journal of virological methods (01.02.1988)

by Gregersen, J.P, Pauli, G, Ludwig, H
Published in Archives of virology (1985)

by Ludwig, H. (Free University Berlin (Germany, F.R.). Institute of Virology), Gregersen, J.P
Published in Revue scientifique et technique (International Office of Epizootics) (1986)

by Gregersen, J.P., Hilfenhaus, J., Lemp, J.F.
Published in Journal of biological standardization (01.01.1989)