Jerzy Kakol, Thomas Gilsdorf, Luis M. Sánchez Ruiz. E). Periodica Mathematica Hungarica, 40(1):31-35, 2000. [doi]
@article{KakolGR00, title = {E)}, author = {Jerzy Kakol and Thomas Gilsdorf and Luis M. Sánchez Ruiz}, year = {2000}, doi = {10.1023/A%3A1004835805140}, url = {http://dx.doi.org/10.1023/A%3A1004835805140}, researchr = {https://researchr.org/publication/KakolGR00}, cites = {0}, citedby = {0}, journal = {Periodica Mathematica Hungarica}, volume = {40}, number = {1}, pages = {31-35}, }