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3. Paléo-bactéries et minéralisations Pb-Zn du Bled Zelfane (Tunisie Centrale);Amouri;Miner. Deposita,1978
4. Trace element and organic carbon content of surface sediment from Grand Traverse Bay, Lake Michigan;Baker-Blocker;Geol. Soc. Am. Bull.,1975
5. Variation in stable C-isotopes in organic matter from the Gunflint iron formation;Barghorn;Geochim. Cosmochim. Acta,1977