1. Anonymous (1989) New varieties of elm raise hope of rebirth for devastated tree. New York Times, Dec 5, p 21
2. Asina S, Hubbes M (1980) Compatibility in Ceratocystis ulmi. Eur J For Pathol 10:201–208
3. Ausubel FM, Brent R, Kingston RE, Moore DD, Seidman JG, Smith JA, Struhl K (1989) Current protocols in molecular biology unit 2.5B, pulsed-field gel electrophoresis. Wiley, Toronto
4. Bernier L (1988) Induction, characterization, and mapping of mutations in Ophiostoma ulmi, the causal agent of Dutch elm disease. PhD thesis, University of Toronto
5. Bernier L, Hubbes M (1990a) Mutations in Ophiostoma ulmi induced by N-methyl-N′-nitro-N-nitrosoguanidine. Can J Bot 68:225–231