@article{ITA_1999__33_4-5_427_0,
     author = {Seidl, Helmut and Niwi\'Nski, Damian},
     title = {On distributive fixed-point expressions},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {427--446},
     publisher = {EDP-Sciences},
     volume = {33},
     number = {4-5},
     year = {1999},
     mrnumber = {1748665},
     zbl = {0945.68127},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1999__33_4-5_427_0/}
}