1. Insect Wounds as Infection Sites forHypoxylon mammatumon Trembling Aspen
2. D. K. Bagga, 1968 : Physiology oi Hypoxylon pruinatum and its pathogenesis on quaking aspen , PhD thesis . University of Wisconsin, Madison. 165 p.
3. S. S. Baker, 1986 : Testing Populus tremuloides tissue culture response to metabolites as an in vitro bioassay for Hypoxylon canker resistance . MS thesis . State University of New York.
4. Gou. Environm, Sc. Forestry , Syracuse, NY. 135 p.