Geodesic
Stratifiable pairs of congruences of figures
Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 3 (1971), pp. 193-220.

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The different types of stratifiable pair of congruences (two-parametric families) of figures are defined in three-dimensional projective space: induced stratifiable pair, curvilinear stratifiable pair, two-sided stratifiable pair. The stratifiable pair of congruences of conics and stratifiable pair formed by congruence of conics and congruence of lines are examined in detail. 
@article{INTG_1971_3_a8,
     author = {V. S. Malakhovskii},
     title = {Stratifiable pairs of congruences of figures},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {193--220},
     publisher = {mathdoc},
     volume = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1971_3_a8/}
}
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V. S. Malakhovskii. Stratifiable pairs of congruences of figures. Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 3 (1971), pp. 193-220. http://geodesic.mathdoc.fr/item/INTG_1971_3_a8/