GEM. International Journal on Geomathematics (GEM Int. J. Geomath.) (20210101), 12, no.~1, Paper No 9, 33~pp. ISSN: 1869-2672 (print).eISSN: 1869-2680.
GEM. International Journal on Geomathematics (GEM Int. J. Geomath.) (20200101), 11, no.~1, Paper No 12, 21~pp. ISSN: 1869-2672 (print).eISSN: 1869-2680.