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References:
[1] Švec A.: Projective Differential Geometry of Line Congruences. Prague 1965. MR 0199806
[2] Гeйбeльмaн: Teopuя aнaлummecкux кoнгpyэнцй nлocкocmeй в кoмлeкcныx u двoйныx yнumapныx нeвклuдoвыx npocmpaнcmвax u npoeкmuвнaя meopuя кoнгpyэнцuй nap nлocкocmeй. Mameмamuчecкuй Cбopнuк, 1959, Т. 49 (91), No 3, p. 281-316
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