Ammonia clathrate hydrates as new solid phases for Titan, Enceladus, and other planetary systems Shin, K. ; Kumar, R. ; Udachin, K. A. ; Alavi, S. ; Ripmeester, J. A. Abstract Publication: Proceedings of the National Academy of Science Pub Date: September 2012 DOI: 10.1073/pnas.1205820109 Bibcode: 2012PNAS..10914785S