**Daniele Bertaccini,**
*Department of Mathematics, University of Rome "Tor Vergata", Italy*
**Michael Botchev,**
*Applied Math Dept, University of Twente, the Netherlands *
**Carmine Di Fiore,**
*Department of Mathematics, University of Rome "Tor Vergata", Italy *
**Dario Fasino,**
*Department of Mathematics, Computer Science and Physics, University of Udine, Italy *
**Sergei Goreinov **
*Institute of Numerical Mathematics, Russian Academy of Sciences, Russia *
**Vladimir Lyashev,**
*Huawei Technologies Co. LTD, Moscow, Russia *
**Carla Manni, **
*Department of Mathematics, University of Rome "Tor Vergata", Italy *
**Nicola Mastronardi,**
*Istituto per le Applicazioni del Calcolo, M. Picone, Bari, Italy *
**Roberto Peirone, **
*Department of Mathematics, University of Rome "Tor Vergata", Italy *
**Stefano Serra-Capizzano,**
*Dipartimento di Scienza ed alta Tecnologia, University of Insubria, Como, Italy *
**Eugene Tyrtyshnikov, **
*Institute of Numerical Mathematics, Russian Academy of Sciences, Russia *
**Nikolai Zamarashkin,**
*Institute of Numerical Mathematics, Russian Academy of Sciences, Russia *
**Paolo Zellini,**
*Department of Mathematics, University of Rome "Tor Vergata", Italy *
Olga Lebedeva, Stefano Cipolla, Fabio Durastante, Daniil Stefonishin, Alexei Ustimenko, Francesco Tudisco