by Hatori, Osamu, Kasuga, Kazuhiro
Published in Banach Journal of Mathematical Analysis (01.01.2009)

by Tseytlin, A. A., Wulff, L.
Published in The journal of high energy physics (01.06.2016)

by Hsu, Ming-Hsiu, Wong, Ngai-Ching
Published in Taiwanese journal of mathematics (01.10.2011)

by Rohman, Minanur, Eryilmaz, Ilker
Published in Journal of the sciences and arts (01.04.2023)

by Hernandez, S., Beckenstein, E., Narici, L.
Published in Manuscripta mathematica (01.12.1995)

by Tseytlin, A A, Wulff, L
Published in arXiv.org (22.06.2016)