Allan L. Edmonds, Mowaffaq Hajja, Horst Martini: Orthocentric Simplices and Biregularity. In: Results in Mathematics. Band52, Nr.1-2, August 2008, ISSN1422-6383, S.41–50, doi:10.1007/s00025-008-0294-4 (springer.com [abgerufen am 29. August 2019]).
springer.com
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Allan L. Edmonds, Mowaffaq Hajja, Horst Martini: Orthocentric Simplices and Biregularity. In: Results in Mathematics. Band52, Nr.1-2, August 2008, ISSN1422-6383, S.41–50, doi:10.1007/s00025-008-0294-4 (springer.com [abgerufen am 29. August 2019]).
zdb-katalog.de
Allan L. Edmonds, Mowaffaq Hajja, Horst Martini: Orthocentric Simplices and Biregularity. In: Results in Mathematics. Band52, Nr.1-2, August 2008, ISSN1422-6383, S.41–50, doi:10.1007/s00025-008-0294-4 (springer.com [abgerufen am 29. August 2019]).