@article{SF_1992__44_1_135127,
     author = {W. Taylor and J. Hyndman and R. McKenzie},
     title = {k-ary monoids of term  operations.},
     journal = {Semigroup forum},
     pages = {21--52},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1992},
     zbl = {0790.08002},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135127/}
}