@article{EUG_2001_56_a12,
     author = {Svetoslav J. Bilchev and  P. Kenderov},
     title = {Bulgarian winter competitions in {Mathematics,} {Informatics} and {Mathematical} {Linguistics}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {89--106},
     year = {2001},
     volume = {56},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_2001_56_a12/}
}