@article{10_4064_cm_31_1_137_153,
     author = {Z. Semadeni},
     title = {On classification, logical educational materials, categories, and automata},
     journal = {Colloquium Mathematicum},
     pages = {137--153},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1974},
     doi = {10.4064/cm-31-1-137-153},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-31-1-137-153/}
}