Y. K. Liao Liao, Y. K., & Amerson, H. V. (1995). Slash pine (Pinus elliottii Engelm.) somatic embryogenesis. I. Initiation of embryogenic cultures from immature zygotic embryos. New Forests, 10(2), 145. Liao, Y. K., & Amerson, H. V. (1995). Slash pine (Pinus elliottii Engelm.) somatic embryogenesis. II. Maturation of somatic embryos and plant regeneration. New Forests, 10(2), 165.