@article{ASUO_2021_XXIX_2_a13,
     author = {T. Glavosits and Zs. Kar\'acsony ~
              },
     title = {Sums and products of intervals in ordered semigroups},
     journal = {Analele Universit\u{a}\c{t}ii "Ovidius" Constan\c{t}a Seria Matematic\u{a}},
     publisher = {mathdoc},
     volume = {XXIX},
     number = {2},
     year = {2021},
     url = {http://geodesic.mathdoc.fr/item/ASUO_2021_XXIX_2_a13/}
}