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• Volume 12

Author: Charvát, František

• Charvát, František: On problems concerning extension of linear operations on linear spaces. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 1, pp. 105-115
• Charvát, František: On problems concerning uniqueness of the extension of linear operations on linear spaces. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 2, pp. 271-280