Tanaka, M., Kawabata, K. S., Maeda, K., Iye, M., Hattori, T., Pian, E., et al. (2009). Spectropolarimetry of the unique type Ib supernova 2005bf: larger asymmetry revealed by later-phase data. The Astrophysical Journal, 699(2), 1119-1124. doi:10.1088/0004-637X/699/2/1119.