2021 Particle beam eigenemittances, phase integral, vorticity, and rotations Phys. Rev. Accel. & Beams 24, 054201 (2021) Authors: L. Groening, C. Xiao, M. Chung Effects of linear quadrupole fringe field [...] transverse matching to an radio frequency quadrupole Nucl. Instrum. & Meth. in Phys. Res. A 165372 (2021) Authors: C. Xiao, L. Groening, P. Gerhard, M.S. Kaiser, M. Maier, S. Mickat, H. Vormann