A correct version of some results by A. Rigas regarding S^3 actions on S^7 × S^3 and on the symplectic group S_(p2) with quotients exotic seven-spheres is presented.
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Zajícek, L. (2005). ON σ-POROUS SETS IN ABSTRACT SPACES. Abstract and Applied Analysis, 2005(), 509-534. https://doi.org/10.1155/AAA.2005.509