Biver, N., Bockelée-Morvan, D., Hartogh, P., de Crovisier J.and Val-Borro, M., Kidger, M., Küppers, M., et al. (2014). Observations of ammonia in comets with Herschel. Talk presented at Asteroids, Comets, Meteors. Helsinki, Finland. 2014-06-30 - 2014-07-04.