Bednarek, Stanisław, and Julian Płoszajski. “The Magnetic Field Produced by a Protons Beam With the Three-Axial Gauss Distribution”. Bulletin de la Société Des Sciences et Des Lettres de Łódź, vol. 68, no. 3, Apr. 2019, pp. 93–112, https://doi.org/10.26485/0459-6854/2018/68.3/8.