@article{horata:1991:cib,
    author = {Horata, K.},
     title = {On congruences involving {B}ernoulli numbers and irregular primes. {II}},
   journal = {Rep. Fac. Sci. Technol. Meijo Univ.},
  fjournal = {Reports of the Faculty of Science. Meijo University},
    volume = {31},
      year = {1991},
     pages = {1–8},
     zblno = {0856.11009}}