Longmore, S. N., Bally, J., Testi, L., Purcell, C. R., Walsh, A. J., Bressert, E., Pestalozzi, M., Molinari, S., Ott, J.,
Cortese, L., Battersby, C., Murray, N., Lee, E., Kruijssen, J. M. D., Schisano, E., & Elia, D. (2013).
Variations in the galactic star formation rate and density thresholds for star formation. Monthly
Notices of the Royal Astronomical Society, 429(2), 987-1000. doi:10.1093/mnras/sts376.