Geodesic
On positional relationship of planes and straight
Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 24 (2003), pp. 155-168

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In the present paper there are considered planes and straight lines in the Lobachevskii space. We find explicit formulas for angle between planes, give analytical description for positional relationship of planes, define angle between any straight lines, and prove theorem on existence and uniqueness of common perpendicular of skew lines. 
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     author = {V. D. Tret'yakov},
     title = {On positional relationship of planes and straight},
     journal = {Trudy Geometricheskogo Seminara},
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     volume = {24},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_2003_24_a14/}
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V. D. Tret'yakov. On positional relationship of planes and straight. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 24 (2003), pp. 155-168. http://geodesic.mathdoc.fr/item/KUTGS_2003_24_a14/