@article{ADM_2007_2_a6,
     author = {Runglawan Butkote and Klaus Denecke},
     title = {Characterization of clones of boolean operations by identities},
     journal = {Algebra and discrete mathematics},
     pages = {70--90},
     publisher = {mathdoc},
     number = {2},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2007_2_a6/}
}