Steciąg, Magdalena, and Anna Karmowska. 2023. “LINGUA MATERNA, LINGUA RECEPTIVA, LINGUA FRANCA, MULTILINGUA FRANCA? THE LINGUASCAPE OF THE POLISH-CZECH BORDERLAND FROM THE PERSPECTIVE OF SUSTAINABLE MULTILINGUALISM”. Sustainable Multilingualism / Darnioji Daugiakalbystė, no. 16 (March):21-38. https://doi.org/10.2478/sm-2020-0002.