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2. Abkowitz, M. and I. Engelstein (1984). Methods for Maintaining Transit Service Regularity, Transportation Research Record, No. 961, pp. 1-8.
3. Optimal Control of Headway Variation on Transit Routes;Abkowitz;Journal of Advanced Transportation,1986
4. A Mathematical Model for Headway Variance of Fixed-Route Buses;Adedisi;Transportation Research,1984