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References:
[1] Švec A.: Projective differential geometry of line congruences. Prague 1965. MR 0199806
[2] Beneš J.: Projective deformation of line congruences in five-dimensional projective spaces. Czech. Math. J., 18 (93) 1968, Praha. MR 0236832
[3] Beneš J.: Point deformation of 2nd order and projective deformation of 3rd order of congruences in projective spaces of $n$ dimensions. Spisy přír. fakulty UJEP, Brno, A 3I (1967), 505-516. MR 0242070
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