@article{AL_2019_58_5_a2,
     author = {A. S. Morozov},
     title = {$\Sigma$-preorderings in ${\mathbb{HF}(\mathbb{R})}$},
     journal = {Algebra i logika},
     pages = {609--626},
     year = {2019},
     volume = {58},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2019_58_5_a2/}
}