On the nature of Type IIn/Ia-CSM supernovae: Optical and near-infrared spectra of SN 2012ca and SN 2013dn

Ori D. Fox, Jeffrey M. Silverman, Alexei V. Filippenko, Jon Mauerhan, Juliette Becker, H. Jacob Borish, S. Bradley Cenko, Kelsey I. Clubb, Melissa Graham, Eric Hsiao, Patrick L. Kelly, William H. Lee, G. H. Marion, Dan Milisavljevic, Jerod Parrent, Isaac Shivvers, Michael Skrutskie, Nathan Smith, John Wilson, Weikang Zheng