By Capelas de Oliveira E.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|40|4|541-550

Taylor & Francis Ltd‎(2009)‎

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By Teodoro G. Sales   Capelas de Oliveira E.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|45|4|595-604

Taylor & Francis Ltd‎(2014)‎

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By Capelas de Oliveira E.   Rodrigues W.   Vaz J.   in Gravitation and Cosmology

ISSN:0202-2893|20|1|10-14

MAIK Nauka/Interperiodica‎(2014)‎

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