@article{ZNSL_2002_293_a7,
     author = {S. I. Nikolenko},
     title = {Hard satisfiable formulas for {DPLL-type} algorithms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {139--148},
     publisher = {mathdoc},
     volume = {293},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2002_293_a7/}
}