Finite-volume schemes for Friedrichs systems with involutions. APPLIED MATHEMATICS AND COMPUTATION, (272)2:420-439, ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA, January 2016. [PUMA: Relaxation Friedrichs schemes; Finite-volume {Involutionary systems; type formulation}]