@article{AUCMP_1977__18_2_a3,
     author = {Gregor, R.},
     title = {The infinite minimal rich monoid},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {23--34},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1977},
     mrnumber = {0498789},
     zbl = {0416.18003},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_1977__18_2_a3/}
}