References
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- Busacker , R. and Saaty , T. 1965 . Finite Graphs and Networks , New York : McGraw‐Hill .
- Billheimer , J. W. and Gray , P. 1973 . “Network design with fixed and variable cost elements” . Transportation Science , February Issue
- Nicolaidis , G. C. 1972 . “Greece: Preliminary report on the inter‐island transportation problem” . Athens, , Greece : Center of Planning and Economic Research . Unpublished Paper