Johnson, Harold L.: Photometric Distances of Galactic Clusters. Astrophysical Journal, vol. 126, p.121, 07/1957. [1]
iop.org
Xiao-Bin Zhang; Rong-Xian Zhang; Zhi-Ping Li: S1280 and S1284: Two Oscillating Blue Stragglers in the Open Cluster M67. Chin. J. Astron. Astrophys., 2005, nro 5, s. 579-586. [4][vanhentunut linkki]
u-strasbg.fr
cdsads.u-strasbg.fr
Richer, Harvey B.; Fahlman, Gregory G.; Rosvick, Joanne; Ibata, Rodrigo: The White Dwarf Cooling Age of M67. The Astrophysical Journal, 1998, nro 504, s. L91-L94. [2]
Hurley, Jarrod R.; Pols, Onno R.; Aarseth, Sverre J.; Tout, Christopher A.: A complete N-body model of the old open cluster M67. Monthly Notices of the Royal Astronomical Society, 10/2005, nro 363, s. 293-314. [3]
