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[2]
BRANCO IM, 1980, 6 U LISB CTR EST APL
[3]
BRANCO IM, 1983, 6 U NOV LISB FAC EC
[4]
BRANCO IM, 1984, 1084 U LISB CTR EST
[5]
Burness R. C., 1976, Transportation Science, V10, P348, DOI 10.1287/trsc.10.4.348
[6]
CERDEIRA JO, 1986, 1486 CTR EST APL NOT
[10]
FENEL Z, 1973, COMMUN ACM, V16, P572