@book{knuth1989concrete,
  address = {Reading},
  author = {Graham, Ronald L. and Knuth, Donald E. and Patashnik, Oren},
  interhash = {a1450d7bb87f0107150d43a314a88326},
  intrahash = {ccef670ef39186763ecd379d2cca1e0a},
  publisher = {Addison-Wesley},
  title = {Concrete Mathematics: A Foundation for Computer Science},
  year = 1989
}