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)
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)