@article{10_4153_S0008414X20000139,
     author = {Kosi\'nski, {\L}ukasz and Zwonek, W{\l}odzimierz},
     title = {Extension {Property} and {Universal} {Sets}},
     journal = {Canadian journal of mathematics},
     pages = {717--736},
     year = {2021},
     volume = {73},
     number = {3},
     doi = {10.4153/S0008414X20000139},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008414X20000139/}
}