SZOMOLÁNYI, Karol - LUKÁČIK, Martin - LUKÁČIKOVÁ, Adriana. Estimation of the Elasticity of Input Substitution in European Regions. In Mathematical Methods in Economics. International Conference. 41th International Conference on Mathematical Methods in Economics (MME 2023) : Proceedings. - Praha : The Czech Society for Operations Research, 2023. ISBN 978-80-11-04132-8. ISSN 2788-3965, pp. 390-394. VEGA 1/0211/21, VEGA 1/0047/23.