Aharonov–Bohm-type effect in the background of a distortion of a vertical line into a vertical spiral W. C. F. da Silva and K. Bakke Eur. Phys. J. C, 79 7 (2019) 559 Published online: 03 July 2019 DOI: 10.1140/epjc/s10052-019-7073-0