Geodesic
Universality property of free groupoid extensions of halfgroupoids and its geometrical meaning
Czechoslovak Mathematical Journal, Tome 25 (1975) no. 4, pp. 562-567

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MR Zbl
DOI : 10.21136/CMJ.1975.101352
Classification : 20L05 
Havel, Václav. Universality property of free groupoid extensions of halfgroupoids and its geometrical meaning. Czechoslovak Mathematical Journal, Tome 25 (1975) no. 4, pp. 562-567. doi: 10.21136/CMJ.1975.101352
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