Minimizing waiting times in a route design problem with multiple use of a single vehicle. Angel-Bello, F., Martínez-Salazar, I., & Alvarez, A. Electronic Notes in Discrete Mathematics, 41:269--276, North-Holland, 2013.
bibtex   
@article{ angel2013minimizing,
  title = {Minimizing waiting times in a route design problem with multiple use of a single vehicle},
  author = {Angel-Bello, Francisco and Martínez-Salazar, Iris and Alvarez, Ada},
  journal = {Electronic Notes in Discrete Mathematics},
  volume = {41},
  pages = {269--276},
  year = {2013},
  publisher = {North-Holland},
  keywords = {pisis}
}

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