Planetary Nebulae Symposium Cornell University, Ithaca, International Astronomical Union, & Terzian, Y. (1978). Planetary nebulae: Observations and theory : Symposium No. 76 held at Cornell University, Ithaca, New York, USA, June 6-10, 1977. D. Reidel Publ. Co..

Planetary Nebulae Symposium Cornell University, Ithaca, International Astronomical Union, and Yervant Terzian. Planetary Nebulae: Observations and Theory : Symposium No. 76 Held at Cornell University, Ithaca, New York, USA, June 6-10, 1977. Dordrecht, Holland ; Boston: D. Reidel Publ. Co., 1978.

Planetary Nebulae Symposium Cornell University, Ithaca, et al. Planetary Nebulae: Observations and Theory : Symposium No. 76 Held at Cornell University, Ithaca, New York, USA, June 6-10, 1977. D. Reidel Publ. Co., 1978.