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Author: Calvert, Bruce

• Fitzpatrick, Simon; Calvert, Bruce: Sets invariant under projections onto two dimensional subspaces. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 32 (1991), issue 2, pp. 233-239
• Fitzpatrick, Simon; Calvert, Bruce: Sets invariant under projections onto one dimensional subspaces. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 32 (1991), issue 2, pp. 227-232