See this page or the paper for documentation.
Please reference to
Widmann, A., Schröger, E., & Maess, B. (2015). Digital filter design for electrophysiological data - a practical approach. Journal of Neuroscience Methods, 250, 34-46.
if you used functions from the EEGLAB firfilt plugin in your manuscript.
v2.8 - Added usefftfilt option to pop_eegfiltnew()
v2.7 - handle better boundary events
v2.7.1 - better handling of boundary events