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B. J. Bok & E. F. Reilly (1947). “Small Dark Nebulae”(PDF). 《Astrophysical Journal》 105: 255. doi:10.1086/144901 (년 이후로 접속 불가 2010-03-19). Yun, Joao Lin; Clemens, Dan P. (1990). “Star formation in small globules - Bart BOK was correct”. 《The Astrophysical Journal》 365: L73.