633–643, University of Arizona Press (2002), ISBN 0-8165-2281-2* Hirayama, Kiyotsugu; "Groups of asteroids probably of common origin", "Astronomical Journal", Vol.
633—643, University of Arizona Press (2002), ISBN 0-8165-2281-2* Hirayama, Kiyotsugu; «Groups of asteroids probably of common origin», "Astronomical Journal", Vol.