The, L.-S., Clayton, D. D., Diehl, R., Hartmann, D. H., Iyudin, A. F., Leising, M. D., et al. (2006). Are ⁴⁴Ti-producing supernovae exceptional? Astronomy & Astrophysics, 450(3), 1037-1050. doi:10.1051/0004-6361:20054626.