@article{NSJOM_1980_10_Nonea_24,
     author = {To\v{s}i\'c Ratko},
     title = {On the class of 

 constant-preserving {Boolean} functions over the finite {Bollean} algebras},
     journal = {Novi Sad Journal of Mathematics},
     pages = {197-203},
     publisher = {mathdoc},
     volume = {10},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1980_10_Nonea_24/}
}