Arhangel’skii, A. V. (1995). 〈Paracompactness and metrization. The method of covers in the classification of spaces〉. 《General topology III: paracompactness, function spaces, descriptive theory》. Encyclopaedia of Mathematical Sciences (영어) 51. 번역 Gould, G. G. 1–70쪽. doi:10.1007/978-3-662-07413-8_1. ISBN978-3-642-08123-1. ISSN0938-0396.
Macula, Anthony J. (1995년 10월). “Lewis Carroll and the enumeration of minimal covers”. 《Mathematics Magazine》 (영어) 68 (4): 269–274. doi:10.2307/2690571. ISSN0025-570X. JSTOR2690571.
jstor.org
Macula, Anthony J. (1995년 10월). “Lewis Carroll and the enumeration of minimal covers”. 《Mathematics Magazine》 (영어) 68 (4): 269–274. doi:10.2307/2690571. ISSN0025-570X. JSTOR2690571.
Arhangel’skii, A. V. (1995). 〈Paracompactness and metrization. The method of covers in the classification of spaces〉. 《General topology III: paracompactness, function spaces, descriptive theory》. Encyclopaedia of Mathematical Sciences (영어) 51. 번역 Gould, G. G. 1–70쪽. doi:10.1007/978-3-662-07413-8_1. ISBN978-3-642-08123-1. ISSN0938-0396.
Macula, Anthony J. (1995년 10월). “Lewis Carroll and the enumeration of minimal covers”. 《Mathematics Magazine》 (영어) 68 (4): 269–274. doi:10.2307/2690571. ISSN0025-570X. JSTOR2690571.