Geodesic
The lattice of varieties of rigid lattice-ordered groups does not have the covering property
Matematičeskie zametki, Tome 47 (1990) no. 4, pp. 35-40.

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     author = {S. A. Gurchenkov},
     title = {The lattice of varieties of rigid lattice-ordered groups does not have the covering property},
     journal = {Matemati\v{c}eskie zametki},
     pages = {35--40},
     publisher = {mathdoc},
     volume = {47},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_4_a4/}
}
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S. A. Gurchenkov. The lattice of varieties of rigid lattice-ordered groups does not have the covering property. Matematičeskie zametki, Tome 47 (1990) no. 4, pp. 35-40. http://geodesic.mathdoc.fr/item/MZM_1990_47_4_a4/