@book{Levy-Lessman-1992-difference,
  mrnumber = {MR1217083 (94e:39002)},
  author = {Levy, H. and Lessman, F.},
  mrclass = {39Axx (39-01)},
  note = {Reprint of the 1961 edition},
  address = {New York},
  title = {Finite difference equations},
  isbn = {0-486-67260-3},
  publisher = {Dover Publications Inc.},
  year = {1992},
  pages = {viii+278},
}