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Mediterranean Journal of Mathematics > 2018 > 15 > 5 > 1-14
Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales.... > 2017 > 111 > 4 > 1201-1222
Results in Mathematics > 2016 > 70 > 1-2 > 81-93
Applied Mathematics and Computation > 2013 > 220 > Complete > 1-11
Journal of Geometry and Physics > 2012 > 62 > 1 > 47-52
Results in Mathematics > 2009 > 56 > 1-4 > 357-368
Journal of Geometry and Physics > 2009 > 59 > 1 > 74-78
Journal of Mathematical Analysis and Applications > 2007 > 334 > 1 > 54-58
Journal of Geometry and Physics > 1999 > 31 > 2-3 > 217-228