@article{10_4064_cm119_2_2,
     author = {Janina Chodukowska and Zbigniew Marciniak},
     title = {On solutions of functional equations determining subsemigroups of $L^1_4$},
     journal = {Colloquium Mathematicum},
     pages = {181--192},
     publisher = {mathdoc},
     volume = {119},
     number = {2},
     year = {2010},
     doi = {10.4064/cm119-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm119-2-2/}
}