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PAPER:   
Astroza, S., P.C. Bhat, C.R. Bhat, R.M. 
	Pendyala, and V.M. Garikapati (2018), "Understanding Activity Engagement Across Weekdays and Weekend Days: 
	A Multivariate Multiple Discrete-Continuous Modeling Approach," Journal of Choice Modelling, 
Vol. 28, pp. 56-70 
	(Keywords: activity-travel demand, modeling weekly activity schedules, time allocation, 
	multiple discrete-continuous probit model, weekday and weekend travel).  
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