@article{10_4064_sm_12_1_93_101,
     author = {A. Alexiewicz},
     title = {On sequences of operations {(IV)}},
     journal = {Studia Mathematica},
     pages = {93--101},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1951},
     doi = {10.4064/sm-12-1-93-101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-12-1-93-101/}
}