Screw dislocation and external fields effects on the Kratzer pseudodot Nahid Soheibi, Majid Hamzavi, Mahdi Eshghi and Sameer M. Ikhdair Eur. Phys. J. B, 90 11 (2017) 212 Published online: 07 November 2017 DOI: 10.1140/epjb/e2017-80468-9