@incollection{MEM_2021_50_a10,
     author = {Manev, Krassimir},
     title = {50 years since publishing the {Cook's} {Theorem}},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {111--122},
     year = {2021},
     volume = {50},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2021_50_a10/}
}