Measurement of D/H and 13C/12C ratios in methane ice on Eris and Makemake: Evidence for internal activity

W. M. Grundy, Ian Wong, Christopher R. Glein, Silvia Protopapa, Bryan J. Holler, J. C. Cook, John Stansberry, J. I. Lunine, A. H. Parker, Heidi B. Hammel, Stefanie N. Milam, R. Brunetto, N. Pinilla-Alonso, Ana Carolina de Souza Feliciano, J. P. Emery, J. Licandro