Citation:
Khan R, Prieto J L, Pojmański G, Stanek K Z, Beacom J F, Szczygiel D M, Pilecki B, Mogren K, Eastman J D, Martini P, et al. Pre-discovery and Follow-up Observations of the Nearby SN 2009nr: Implications for Prompt Type Ia Supernovae. \apj. 2011;726 (2) :106.