Experimental proof of faster-is-slower in systems of frictional particles flowing through constrictions - Pastor, JM; Garcimartin, A; Gago, PA; Peralta, JP; Martin-Gomez, C; Ferrer, LM; Maza, D; Parisi, DR; Pugnaloni, LA; Zuriguel, I (PHYSICAL REVIEW E, 2015)