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Partially supported by a DGICYT Grant No. PS87-0115-C03.
Supported by a FPPI Grant, Program PG, Ministerio de Educatión y Ciencia.
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Ferrández, A., Garay, O.J. & Lucas, P. Finite type ruled manifolds shaped on spherical submanifolds. Arch. Math 57, 97–104 (1991). https://doi.org/10.1007/BF01200045
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DOI: https://doi.org/10.1007/BF01200045