Kwiatkowski, Eugeniusz, and Przemysław Włodarczyk. 2017. “Types of Employment Contracts and Elasticity of Employment in the European Union New Member States in 2000–2014”. Acta Universitatis Lodziensis. Folia Oeconomica 2 (328):[163]-183. https://doi.org/10.18778/0208-6018.328.11.