Beginning of activity in 67P/Churyumov-Gerasimenko and predictions for 2014-2015

Snodgrass, C., Tubiana, C., Bramich, D. M., Meech, K., Boehnhardt, H., Barrera, L. (). Beginning of activity in 67P/Churyumov-Gerasimenko and predictions for 2014-2015. , 557,