Shara, Michael M.; Zurek, David R.; Williams, Robert E.; Prialnik, Dina; et al. (June 1997). "HST Imagery of the Non-Expanding, Clumped "Shell" of the Recurrent Nova T Pyxidis". Astronomical Journal. 114 (1): 258. Bibcode:1997AJ....114..258S. doi:10.1086/118470.
Shara, Michael M.; Zurek, David R.; Williams, Robert E.; Prialnik, Dina; et al. (June 1997). "HST Imagery of the Non-Expanding, Clumped "Shell" of the Recurrent Nova T Pyxidis". Astronomical Journal. 114 (1): 258. Bibcode:1997AJ....114..258S. doi:10.1086/118470.