1. A. G. G. M. Tielens, in Astrophysical Implications of the Laboratory Study of Presolar Materials, T. J. Bernatowicz, E. Zinner, Eds. (AIP Conference Proceedings 402, American Institute of Physics, Woodbury, NY, 1998), pp. 523–544.
2. S. Messenger, R. M. Walker, in Astrophysical Implications of the Laboratory Study of Presolar Materials, T. J. Bernatowicz, E. Zinner, Eds. (AIP Conference Proceedings 402, American Institute of Physics, Woodbury, NY, 1998), pp. 545–564.
3. H/D = 6666 12 C/ 13 C = 90 and 14 N/ 15 N = 272. Isotopic anomalies are often expressed as delta values representing the deviation of the measured isotopic ratio from the terrestrial standard in parts per thousand (‰).
4. J. P. Bradley, in Meteorites, Planets, and Comets, A. M. Davis, Ed. (Vol. 1, Treatise on Geochemistry, H. D. Holland, K. K. Turekian, Exec. Eds., Elsevier Science, 2003), pp. 689–711.