Getman, K. V.; et al. (2012). "The Elephant Trunk Nebula and the Trumpler 37 cluster: contribution of triggered star formation to the total population of an H II region". Monthly Notices of the Royal Astronomical Society. 426 (4): 2917–2943. arXiv:1208.1471 . Bibcode:2012MNRAS.426.2917G. doi:10.1111/j.1365–2966.2012.21879.x.
doi.org
Elmegreen, B. G.; Lada, C. J. (1977). "Sequential formation of subgroups in OB associations". Astrophysical Journal, Part 1. 214: 725–741. Bibcode:1977ApJ…214..725E. doi:10.1086/155302.
Getman, K. V.; et al. (2012). "The Elephant Trunk Nebula and the Trumpler 37 cluster: contribution of triggered star formation to the total population of an H II region". Monthly Notices of the Royal Astronomical Society. 426 (4): 2917–2943. arXiv:1208.1471 . Bibcode:2012MNRAS.426.2917G. doi:10.1111/j.1365–2966.2012.21879.x.
harvard.edu
ui.adsabs.harvard.edu
Elmegreen, B. G.; Lada, C. J. (1977). "Sequential formation of subgroups in OB associations". Astrophysical Journal, Part 1. 214: 725–741. Bibcode:1977ApJ…214..725E. doi:10.1086/155302.
Getman, K. V.; et al. (2012). "The Elephant Trunk Nebula and the Trumpler 37 cluster: contribution of triggered star formation to the total population of an H II region". Monthly Notices of the Royal Astronomical Society. 426 (4): 2917–2943. arXiv:1208.1471 . Bibcode:2012MNRAS.426.2917G. doi:10.1111/j.1365–2966.2012.21879.x.