@article{AM2_1995__50_1-2_137617,
     author = {Robert W. Quackenbush},
     title = {A survey of minimal clones.},
     journal = {Aequationes mathematicae},
     pages = {3--16},
     publisher = {mathdoc},
     volume = {50},
     number = {1-2},
     year = {1995},
     zbl = {0833.08004},
     url = {http://geodesic.mathdoc.fr/item/AM2_1995__50_1-2_137617/}
}