1. DEJONCKHEERE, W., STEURBAUT, W. & KIPS, R.H. Med. Fac. Landb. Gent39/1, 297–300, 1974a
2. CASANOVA, M. & DUBROCA, J. Comptes Rendus des Séances de l'Acad. d'Agric. de France,12, 990–998, 1972.
3. GORBACH, S. & WAGNER, U. J. Agr. Food Chem.15, 4, 654–656, 1967.
4. KO, W.H. & FARLEY, J.D. Phytopathology,59, 64–67, 1969.
5. KUCHAR, E.J., GEENTRY, F.O., GRIFFITH, W.P. & THOMAS, R.J. J. Agr. Food Chem.17, 6, 1237–1240, 1969.