@unpublished{Conforti2015,
  author  = {Giovanni Conforti},
  title   = {Reciprocal classes of continuous time Markov Chains},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprints des Instituts f{\"u}r Mathematik der Universit{\"a}t Potsdam},
  number    = {4 (2015) 8},
  pages     = {198},
  year    = {2015},
}