Maciejewski, W. (October 2008). Funes, José G.; J., S.; Corsini, Enrico Maria (eds.). Orbits in Corotating and Counterrotating Double Bars. Proceedings of the conference held 1-5 October, 2007 at the Centro Convegni Matteo Ricci, Rome, Italy. Formation and Evolution of Galaxy Disks ASP Conference Series. Vol. 396. San Francisco: Astronomical Society of the Pacific. p. 367. arXiv:0801.1471. Bibcode:2008ASPC..396..367M.
Maciejewski, W. (October 2008). Funes, José G.; J., S.; Corsini, Enrico Maria (eds.). Orbits in Corotating and Counterrotating Double Bars. Proceedings of the conference held 1-5 October, 2007 at the Centro Convegni Matteo Ricci, Rome, Italy. Formation and Evolution of Galaxy Disks ASP Conference Series. Vol. 396. San Francisco: Astronomical Society of the Pacific. p. 367. arXiv:0801.1471. Bibcode:2008ASPC..396..367M.