@article {1703.08156, archivePrefix = {arXiv}, eprint = {1703.08156}, primaryClass = {gr-qc}, author = {Sebastian H. Völkel and Kostas D. Kokkotas}, title = {A Semi-analytic Study of Axial Perturbations of Ultra Compact Stars}, publisher = {Institute of Physics}, year = {2017}, doi = {10.1088/1361-6382/aa68cc}, url = {http://arxiv.org/abs/1703.08156} }