On the derivation of the non-Euclidean angle of parallelism function.
Ruoff, Dieter
Beiträge zur Algebra und Geometrie, Tome 36 (1995), p. 235-241 / Harvested from The Electronic Library of Mathematics
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Publié le : 1995-01-01
EUDML-ID : urn:eudml:doc:230038 
@article{00821693,
     title = {On the derivation of the non-Euclidean angle of parallelism function.},
     journal = {Beitr\"age zur Algebra und Geometrie},
     volume = {36},
     year = {1995},
     pages = {235-241},
     zbl = {0842.51009},
     language = {en},
     url = {http://dml.mathdoc.fr/item/00821693}
}

Ruoff, Dieter. On the derivation of the non-Euclidean angle of parallelism function.. Beiträge zur Algebra und Geometrie, Tome 36 (1995) pp. 235-241. http://gdmltest.u-ga.fr/item/00821693/