Chríbik, A.; Polóni, M.; Lach, J.; Ragan, B. THE EFFECT OF ADDING HYDROGEN ON THE PERFORMANCE AND THE CYCLIC VARIABILITY OF A SPARK IGNITION ENGINE POWERED BY NATURAL GAS. Acta Polytech 2014, 54 (1), 10-14. https://doi.org/10.14311/AP.2014.54.0010.