Minimizing Waiting Times in Integrated Fixed Interval Timetables by Upgrading Railway Tracks. Nachtigall, K. & Voget, S. European Journal of Operational Research, 103:610--627, 1997.
bibtex   
@article{Nachtigall97,
   author = {Karl Nachtigall and Stefan Voget},
   journal = {European Journal of Operational Research},
   key = {Nachtigall \& Voget, 1997},
   pages = {610--627},
   title = {Minimizing {W}aiting {T}imes in {I}ntegrated {F}ixed
{I}nterval {T}imetables by {U}pgrading {R}ailway {T}racks},
   volume = {103},
   year = {1997}
}

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