@article{CM_1959-1960__14__228_0,
     author = {Hughes, N. J. S.},
     title = {The {Jordan-H\"older-Schreier} theorem for general algebraic systems},
     journal = {Compositio Mathematica},
     pages = {228--236},
     publisher = {Kraus Reprint},
     volume = {14},
     year = {1959-1960},
     mrnumber = {130845},
     zbl = {0108.01804},
     language = {en},
     url = {http://www.numdam.org/item/CM_1959-1960__14__228_0/}
}