@article{NSJOM_1984__14__a30,
     author = {To\v{s}i\'c Ratko},
     title = {Four 

 counterfeit coins},
     journal = {Novi Sad Journal of Mathematics},
     pages = {99-108},
     publisher = {mathdoc},
     volume = {14},
     year = {1984},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1984__14__a30/}
}