%0 Journal Article %A Krzysztof Petelczyc %A Krzysztof Prażmowski %A Mariusz Żynel %T Geometry of the parallelism in polar spine spaces and their line reducts %J Ars Mathematica Contemporanea %D 2021 %P 151-170 %V 20 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.26493/1855-3974.2201.b65/ %R 10.26493/1855-3974.2201.b65 %G en %F 10_26493_1855_3974_2201_b65