^Billot, N.; Noriega-Crespo, A.; Carey, S.; Guieu, S.; Shenoy, S.; Paladini, R.; Latter, W. Young Stellar Objects and Triggered Star Formation in the Vulpecula Ob Association. The Astrophysical Journal. 2010, 712 (2): 797. Bibcode:2010ApJ...712..797B. arXiv:1003.0866. doi:10.1088/0004-637X/712/2/797.