Foraminifera source request

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Ganelina, R.A., Grozdilova, L.P., Lebedeva, N.S. and Sosnina, M.I. (1972). Таксономическое значение признака выпрямления раковины у палеозойских фораминифер (Taxonomic significance of the evidence of the test-straightening in Paleozoic Foraminifera). Voprosy Mikropaleontologii, 15: 30-39 (in Russian).