Do Slow Waves Trigger Pulsations in Two-Ribbon Flares? An observational search, by Andrew Inglis and Brian Dennis: slow MHD waves, QPPs, and hard X-rays.

http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/Do_slow_waves_trigger_pulsations_in_two-ribbon_flares%3F_An_observational_search