Hamaekers H. Prof. Wlodzimierz Nykiel 70: From Cooperation to Friendship. In: Kukulski Z, Sęk M, eds. Challenges of Contemporary Tax Law: Jubilee Book Dedicated to Professor Włodzimierz Nykiel. Volume II. Lodz University Press; 2024:39-43. doi:10.18778/8331-399-3.05