TY  - BOOK
AU  - Bonsen, K. J. M.
AU  - Elgersma.
AU  - Scheffer, R. J.
TI  - Barrier zone formation as a resistance mechanisms of elms to dutch elm disease
KW  - Olmo
KW  - Enfermedades
N1  - Sobretiro de : IAWA. Bulletin N.S. : 6 (1): 71-77, 1985
ER  -