S. J. Clemett, C. R. Maechling, R. N. Zare, and C. M. O.-D. Alexander, “Analysis of Polycyclic Aromatic Hydrocarbons in Seventeen Ordinary and Carbonaceous Chondrites,”Lunar Planet. Sci. Conf. XXIII, 233 (1992).
S. J. Clemett, C. R. Maechling, R. N. Zare, and C. M. O.-D. Alexander, “Analysis of Polycyclic Aromatic Hydrocarbons in Seventeen Ordinary and Carbonaceous Chondrites,”Lunar Planet. Sci. Conf. XXIII, 233 (1992).