MMS Observations of Reconnection at Dayside Magnetopause Crossings During Transitions of the Solar Wind to Sub-Alfvénic Flow. - Farrugia, C. J.; Lugaz, N.; Alm, L.; Vasquez, B.; Argall, M. R.; Kucharek, H.; Matsui, H.; Torbert, R. B.; Lavraud, B.; Le Contel, O.; Cohen, I. J.; Burch, J. L.; et al. (Journal of Geophysical Research. Space Physics, 2017)