@article{10_21136_MB_1996_126108,
     author = {Chajda, Ivan and Emanovsk\'y, Petr},
     title = {$\Sigma${-Hamiltonian} and $\Sigma$-regular algebraic structures},
     journal = {Mathematica Bohemica},
     pages = {177--182},
     publisher = {mathdoc},
     volume = {121},
     number = {2},
     year = {1996},
     doi = {10.21136/MB.1996.126108},
     mrnumber = {1400610},
     zbl = {0863.08001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1996.126108/}
}