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G. Evelyn Hutchinson, Enrico Bonatti, Ursula M. Cowgill, Clyde E. Goulden, Elaine A. Leventhal, M. E. Mallett, Fiorenza Margaritora, Ruth Patrick, A. Racek, Selwyn A. Roback, Emilia Stella, J. B. Ward-Perkins, Thomas R. Wellman, Ianula: An Account of the History and Development of the Lago di Monterosi, Latium, Italy, Transactions of the American Philosophical Society, Vol. 60, No. 4 (1970), pp. 1-178
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Hutchinson et al. (1970) studied this question.
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