John J. Lee, Hugo D. Freudenthal, William A. Muller, Victor Kossoy, Stanley Pierce, Richard Grossman, Growth and Physiology of Foraminifera in the Laboratory: Part 3: Initial Studies of Rosalina floridana (Cushman), Micropaleontology, Vol. 9, No. 4 (Oct., 1963), pp. 449-466
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Lee et al. (1963) studied this question.