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14F35 Homotopy theory; fundamental groups (2 articles)

• Ayala, Víctor; Kizil, Eyüp: The covering semigroup of invariant control systems on Lie groups. (English). Kybernetika, vol. 52 (2016), issue 6, pp. 837-847
• Gelbukh, Irina: Co-rank and Betti number of a group. (English). Czechoslovak Mathematical Journal, vol. 65 (2015), issue 2, pp. 565-567