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: Finite-volume Friedrichs Relaxation formulation} schemes; systems; type {Involutionary]