1. ABELSON, P. H., FORTSCHRITTE DER CHEMIE ORGANISCHER NATURSTOFFE 17: 379 (1959).
2. ABELSON, P.H., GEOCHIM COSMOCHIM AC 27: 1113 (1963).
3. BARGHOORN, E.S., FOSSIL ORGANISMS FROM PRECAMBRIAN SEDIMENTS, ANNALS OF THE NEW YORK ACADEMY OF SCIENCES 108: 451 (1963).
4. BENDORAITIS, J. G., ANALYTICAL CHEMISTRY 34: 49 (1962).
5. Bergmann, W., Organic Geochemistry: 534 (1963).