Volume 21, Issue 4

Part 1: Special Issue: Selected Papers from the 8th International Work-Conference on the Interplay Between Natural and Artificial Computation, IWINAC 2019, Almería, Spain / Special Issue: Selected Papers from the 8th International Conference on the Theory and Practice of Natural Computing, TPNC 2019, Kingston ON, Canada

Issue Editors:

• Jose´ Manuel Ferra´ndez Vicente,
• Jose´ Santos Reyes,
• Carlos Martı´n-Vide,
• Miguel A. Vega-Rodrı´guez