@article{CTT100659953,
  author = {Yoshiko IKEBE and Tomomi Matsui and Akihisa TAMURA},
  title = {Adjacency of the Best and Second Valued Best Solutions in Combinatorial Optimization Problems},
  journal = {Discrete Applied Mathematics},
  year = 1993,
}

@article{CTT100659954,
  author = {Yasufumi SARUWATARI and Tomomi Matsui},
  title = {A Note on K Best Solutions to the Chinese Postman Problem},
  journal = {SIAM Journal on Optimization},
  year = 1993,
}