@article{Skab2017, author = "Ihor Skab and Yurij Vasylkiv and Bohdan Zapeka and Viktoriya Savaryn and Rostyslav Vlokh", title = "{Media 1: Appearance of singularities of optical fields under torsion of crystals containing threefold symmetry axes}", year = "2017", month = "4", url = "https://opticapublishing.figshare.com/articles/media/Media_1_Appearance_of_singularities_of_optical_fields_under_torsion_of_crystals_containing_threefold_symmetry_axes/4916936", doi = "10.1364/JOSAA.28.001331.m001" }