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2. Loess and Quaternary deposits in the Trebbia Area (Piacenza);Baroni,1990
3. Paleosols Quaternaires de l'Alta Pianura de Milan, interpretation stratigrafique e paleoclimatique;Billard;Bulletin de l'Association Francaise pour l'Etude du Quaternaire,1974
4. Quaternary Paleosols as indicators of the Changing Landscape on the Northern and Southern Piedmonts of the Alps;Billard,1985
5. Is a middle Pleistocene climatic optimum recorded in the loess- paleosol sequences of Eurasia?;Billard;Quaternary International,1993