Piętka M. The estimation of the operational functions of the type exp[(Σ_{ν=1}^nβ_νs^{p_ν})λ]. AMSil [Internet]. 28Sep.1990 [cited 10May2024];4:25-4. Available from: https://www.journals.us.edu.pl/index.php/AMSIL/article/view/14290