Geodesic
Free $\ell $-groups and free products of $\ell $-groups
Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) no. 4, pp. 617-625.

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In this paper we have given the construction of free $\ell $-groups generated by a po-group and the construction of free products in any sub-product class $\Cal U$ of $i\ell$-groups. We have proved that the $\Cal U$-free products satisfy the weak subalgebra property.
Classification : 06F15, 20F60
Keywords: lattice-ordered group ($\ell $-group); free $\ell $-group; free product of $\ell $-groups; sub-product class of $\ell $-groups 
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Ton, Dao-Rong. Free $\ell $-groups and free products of $\ell $-groups. Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) no. 4, pp. 617-625. http://geodesic.mathdoc.fr/item/CMUC_1994__35_4_a2/