@article{SF_1976__12_134160,
     author = {H. Storrer},
     title = {An algebraic proof of {Isbell'} s zigzag theorem.},
     journal = {Semigroup forum},
     pages = {83--88},
     publisher = {mathdoc},
     volume = {12},
     year = {1976},
     zbl = {0325.20064},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__12_134160/}
}