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References:
[1] Švec A.: Projective Differential Geometry of Line Сongruences. Prague 1965.
[2] Kerndl J.: Deformation of surfaces immersed in unimodular affine space of four dimensions. Čas. pӗst. mat. 94 (1969), Praha. MR 0253189 | Zbl 0169.52602
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