@article{10_37236_1040,
     author = {N. Kolev and N. Nenov},
     title = {New upper bound for a class of vertex {Folkman} numbers},
     journal = {The electronic journal of combinatorics},
     year = {2006},
     volume = {13},
     doi = {10.37236/1040},
     zbl = {1081.05072},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1040/}
}