Geodesic
The intrinsic normalizations of a~nonholonomic hypercomplex $NGr(1,4,5)$
Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 4 (1973), pp. 121-154.

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This paper is a continuation of the paper by S. Grigelionis [2]. The study of the first neighbourhood of non-holonomic hypercomplex element of the projective space $P_4$ is continued (in the previous paper [2] a non-holonomic hypercomplex was called a non-holonomic complex), but the attention is paid mainly to problems of intrinsic normalizations of such non-holonomic hypercomplexes. So called intrinsic normal spaces of the first and the second kind, an intrinsic normal plane, an intrinsic normal line and some one-to-one correspondences between the normal spaces are obtained. The geometrical interpretations of all these objects and correspondences are given. 
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     title = {The intrinsic normalizations of a~nonholonomic hypercomplex $NGr(1,4,5)$},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
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     volume = {4},
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V. I. Bliznikas; S. I. Grigelionis. The intrinsic normalizations of a~nonholonomic hypercomplex $NGr(1,4,5)$. Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 4 (1973), pp. 121-154. http://geodesic.mathdoc.fr/item/INTG_1973_4_a2/