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Über die Punktdeformation einer vollständig fokalen Pseudokongruenz. (German) Zbl 0177.49803

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References:
[1] Čech, O Czechosl. Math. J. 5 pp 234– (1955)
[2] – 5, 1961,
[3] B., Czechosl. Math. J. 34 pp 499– (1954)
[4] Švec, Czechosl. Math. J. 7 pp 57– (1957)
[5] Projective Differential Geometry of Line Congruences. Prague 1965. · Zbl 0187.19001
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