Geodesic
Parabolic parallelograms of the plane~$\widehat H$
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 14 (2014) no. 1, pp. 20-28

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Parabolic parallelograms on a Hyperbolic Plane $\widehat H$ with the positive curvature in the Cayley–Klein model are investigated. We conducted their classification, obtained the metric correlations between the measure of angles and the expressions of lengths of the edges through a measure of included angles. 
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     author = {L. N. Romakina},
     title = {Parabolic parallelograms of the plane~$\widehat H$},
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L. N. Romakina. Parabolic parallelograms of the plane~$\widehat H$. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 14 (2014) no. 1, pp. 20-28. http://geodesic.mathdoc.fr/item/ISU_2014_14_1_a2/