@article{ASUO_2014_XXII_1_a15,
     author = {Chvalina J. and Hoskova-Mayerova S.},
     title = {On certain proximities and preorderings on the transposition hypergroups of linear first-order partial differential operators},
     journal = {Analele Universit\u{a}\c{t}ii "Ovidius" Constan\c{t}a Seria Matematic\u{a}},
     publisher = {mathdoc},
     volume = {XXII},
     number = {1},
     year = {2014},
     url = {http://geodesic.mathdoc.fr/item/ASUO_2014_XXII_1_a15/}
}