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"Conditions for the normal rectilinear congruences whose focal surfaces are ..."
D. Alexiou, G. Tsagas, C. Frangakis (2001)
- D. Alexiou, G. Tsagas, C. Frangakis:
Conditions for the normal rectilinear congruences whose focal surfaces are minimal. Int. J. Comput. Math. 77(3): 335-345 (2001)
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