@article{NSJOM_1989_19_2a_4,
     author = {To\v{s}i\'c 

 Ratko and Bo\v{s}njak Ivica},
     title = {Counting generation and 

 recognition of {S-sequences}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {53-60},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1989},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1989_19_2a_4/}
}