DORMAND, John R.; WOOLFSON, Mark M. The capture theory and planetary condensation. Monthly Notices of the Royal Astronomical Society. 1971, roč. 151, s. 307–301. Dostupné online [PDF]. ISSN0035-8711. (anglicky)
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Michael M. Woolfson [online]. International Astronomical Union, rev. 1988-1-4 [cit. 2010-05-03]. Dostupné online. (anglicky)
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New Solar Systems [online]. University of Tennessee, Department of Physics and Astronomy [cit. 2010-05-03]. Dostupné online. (anglicky)
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DORMAND, John R.; WOOLFSON, Mark M. The capture theory and planetary condensation. Monthly Notices of the Royal Astronomical Society. 1971, roč. 151, s. 307–301. Dostupné online [PDF]. ISSN0035-8711. (anglicky)
Professor Michael Woolfson, MA (Oxon), PhD, DSc (Manchester), CPhys, FRAS, FInstP, FRS [online]. University of York, rev. 2009-7-28 [cit. 2010-05-03]. Dostupné online. (anglicky)