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Author: Kobak, Piotr

• Kobak, Piotr: The structure tensor and first order natural differential operators. (English). Archivum Mathematicum, vol. 28 (1992), issue 2, pp. 121-138
• Kobak, Piotr: Natural liftings of vector fields to tangent bundles of bundles of $1$-forms. (English). Mathematica Bohemica, vol. 116 (1991), issue 3, pp. 319-326