1. Durzan, D. J. Progress and promise in forest genetics. In: Paper Science and Technology: The Cutting Edge, 50th Anniversary, May 8–10, 1979. Appleton, WI: The Institute of Paper Chemistry; 1980:31–60.
2. Durzan, D. J. Somatic embryogenesis and sphaeroblasts in conifer suspensions. In: Fujiwara, A. ed. Plant Tissue Culture. Tokyo, Japan: Proc. 5th Intl. Cong. Plant Tissue Culture; 1982:113–114.
3. Feder, N.; O'Brien, T. P. Plant microtechnique: some principles and methods. Am. J. Bot. 55:123–142; 1968.
4. Gupta, P. K.; Durzan, D. J. Shoot multiplication from mature trees of Douglas-fir (Pseudotsuga menziesii) and sugar pine (Pinus lambertiana). Plant Cell Repts 4:177–179; 1985.
5. Gupta, P. K.; Durzan, D. J. Somatic polyembryogenesis from callus of mature sugar pine embryos. Bio/Technology; 1986:4:643–645.