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Bibcode:1978GAM....15.....H. doi:10.1007/978-94-009-9836-0. ISBN 978-90-277-0886-1. {{cite book}}: |journal= ignored (help) Wagman, M. (August 1987)...

Double Stars. pp. 144–145. doi:10.1007/978-94-009-9836-0_52. ISBN 978-90-277-0886-1. Beals, C.S. (1933). "Classification and temperatures of Wolf–Rayet...