K
[Kar72] Richard M. Karp. Reducibility Among Combinatorial Problems. In CCC'72, IBM Research Symposia Series, pages 85-103. Plenum Press, March 1972. 
@inproceedings{ccc1972-Kar,
  author =              {Karp, Richard M.},
  title =               {Reducibility Among Combinatorial Problems},
  editor =              {Miller, Raymond E. and Thatcher, James W.},
  booktitle =           {{P}roceedings of a symposium on the Complexity of
                         Computer Computations ({CCC}'72)},
  acronym =             {{CCC}'72},
  publisher =           {Plenum Press},
  series =              {IBM Research Symposia Series},
  pages =               {85-103},
  year =                {1972},
  month =               mar,
}
List of authors