PERCH-NIELSEN, K. Katharina Perch-Nielsen: Coccoliter. Varv, [S. l.], v. 1970, n. 2, p. 52–56, 1970. DOI: 10.7146/varv.v1970i2.151081. Disponível em: https://tidsskrift.dk/varv/article/view/151081. Acesso em: 8 jan. 2025.