@article{Flieger:2020Zz, author = "Flieger, Wojciech Jakub and Grzanka, Krzysztof Grzegorz", title = "{New constraints on heavy neutral leptons coming from oscillation data analysis and precision $e^{+}e^{-}$ physics}", doi = "10.22323/1.390.0129", journal = "PoS", year = 2020, volume = "ICHEP2020", pages = "129" }