Geodesic
Free sub-bands of finitely presented bands
Glasgow mathematical journal, Tome 41 (1999) no. 1, pp. 145-150

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For each variety of bands [Vscr], we give a formula for φ[Vscr](m,k), which is the largest integer such that for every band B in [Vscr] generated by m generators and k relations, there is a subset of the generators of size φ[Vscr](m,k) which generates a (relatively) free sub-band of B as a basis. We also determine the semilattice structure of a finitely presented band. 
LAU, JOSEPH. Free sub-bands of finitely presented bands. Glasgow mathematical journal, Tome 41 (1999) no. 1, pp. 145-150. doi: 10.1017/S0017089599970659
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     title = {Free sub-bands of finitely presented bands},
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     doi = {10.1017/S0017089599970659},
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