Dust-ion-acoustic shock waves in nonextensive dusty multi-ion plasmas S. A. Ema, M. Ferdousi, S. Sultana and A. A. Mamun Eur. Phys. J. Plus, 130 3 (2015) 46 Published online: 12 March 2015 DOI: 10.1140/epjp/i2015-15046-0