@article{10_4153_S0008439519000420,
     author = {Bella, Angelo and Spadaro, Santi},
     title = {A {Common} {Extension} of {Arhangel{\textquoteright}sk\u{i}{\textquoteright}s} {Theorem} and the {Hajnal{\textendash}Juh\'asz} {Inequality}},
     journal = {Canadian mathematical bulletin},
     pages = {197--203},
     year = {2020},
     volume = {63},
     number = {1},
     doi = {10.4153/S0008439519000420},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439519000420/}
}