@article{10_21136_CMJ_1993_128399,
     author = {Darnel, Michael R.},
     title = {Cyclic extensions of the {Medvedev} ordered groups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {193--204},
     publisher = {mathdoc},
     volume = {43},
     number = {2},
     year = {1993},
     doi = {10.21136/CMJ.1993.128399},
     mrnumber = {1211742},
     zbl = {0790.06018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1993.128399/}
}