Enjoying Natural Computing Essays Dedicated to Mario de Jesús Pérez-Jiménez on the Occasion of His 70th Birthday - Graciani, Carmen; Graciani, Carmen; Riscos-Núñez, Agustín; Riscos-Núñez, Agustín; Păun, Gheorghe; Păun, Gheorghe; Rozenberg, Grzegorz; Rozenberg, Grzegorz; Salomaa, Arto; Salomaa, Arto (Springer International Publishing : Imprint: Springer, 2018)