@techreport{denes76,
  address = {Montgomery, Alabama},
  author = {Denes, J. and Kim, K. H. and Roush, F. W.},
  institution = {Alabama State University},
  interhash = {28296e01e11d6ddfe1b51feb4d78b9c9},
  intrahash = {9f81cc6dd933352e97e8e20861ef38ed},
  title = {A characterization of an inverse for semigroup elements},
  type = {Seminar Report},
  year = { 1976}
}