@article{NSJOM_1984__14__a34,
     author = {Acketa 

 Dragan M.},
     title = {On the enumeration of 

 cyclic squares},
     journal = {Novi Sad Journal of Mathematics},
     pages = {145-171},
     publisher = {mathdoc},
     volume = {14},
     year = {1984},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1984__14__a34/}
}