@article{BSL7_2_Kotas_da_Costa,
author = {Jerzy KOTAS and Newton C. A. {da COSTA}},
title = {On the Problem of Jaśkowski and the Logic of {\L}ukasiewicz},
journal = {Bulletin of the Section of Logic},
volume = {7},
number = {2},
year = {1978},
pages = {91}
}