Fijorek, Kamil. 2015. “Firth’s Logistic Regression Approximation by Weighting Observations”. Krakow Review of Economics and Management Zeszyty Naukowe Uniwersytetu Ekonomicznego W Krakowie, no. 923 (December): 87-98. https://doi.org/10.15678/ZNUEK.2013.0923.07.