@article {roy2015phoneahmedabad,
	title = {Phone call elasticity of city travel in Ahmedabad},
	journal = {Travel Behaviour and Society},
	volume = {2},
	number = {1},
	year = {2015},
	month = {Jan},
	pages = {15{\textendash}25},
	abstract = {{\textcopyright} 2014 Hong Kong Society for Transportation Studies. The new era of Information and Communication Technologies ICT enables people to communicate and interact with each other in different manner, changing the way they conduct their lives. This change has significant implications on their physical travels. The relationship between ICTs and travel is complex and sometimes indirect. This paper aims to better understand this complex relationship by empirically analyzing the substitution versus additive effects of phone calls on physical distance traveled by individuals. This is done by analyzing the phone call elasticity of physical travel. The analysis also studies the relevance of social ties in Ahmedabad, India, as a source of explanation of social activity, thus travel, undertaken by individuals. Social Network Analysis (SNA) allows capturing social determinants that affect travel in a way socio-demographics do not capture. The phone call elasticities show a variation among different people which can be connected to the type of trips that are substituted. The substituted trips are related to the social networks of individuals. Decision makers can use this tool to designing their travel and ICT policies in a novel way.},
	issn = {2214-367X},
	doi = {10.1016/j.tbs.2014.07.001},
	author = {Roy, P and Zuidgeest, MHP and Martinez, JA and Miscione, G and van Maarseveen, MFAM}
}
@article {roy2012using,
	title = {Using social network analysis to profile people based on their e-communication and travel balance},
	journal = {Journal of Transport Geography},
	volume = {24},
	year = {2012},
	pages = {111{\textendash}122},
	publisher = {Pergamon},
	author = {Roy, P and Mart{\'{\i}nez, AJ and Miscione, G and Zuidgeest, MHP and van Maarseveen, MFAM}
}
@article {roy2012usingbalance,
	title = {Using Social Network Analysis to profile people based on their e-communication and travel balance},
	journal = {Journal of Transport Geography},
	volume = {24},
	year = {2012},
	month = {Sep},
	pages = {111{\textendash}122},
	abstract = {The new era of Information and Communication Technologies (ICT) enables people to communicate and interact with each other in new and different manners, changing the way they conduct their daily lives. This change inevitably has significant implications for physical travel in the age of electronic communication (e-communication). This paper aims to provide greater insight into people{\textquoteright}s travel behavior based on their e-Communication to Travel balance (C/. T balance). This balance represents the ratio between an individual{\textquoteright}s e-communication and physical travel. The analysis studies the relevance of social ties in Ahmedabad, India, as a source of explanation of social activity, thus travel, undertaken by individuals. It is hypothesized that the C/. T balance emerges from an individual{\textquoteright}s social network characteristics. The ability of an individual to engage in social activities not only depends on the individual{\textquoteright}s socioeconomic and lifestyle attributes, but also on the {\textquoteright}modality{\textquoteright} of such interactions (e.g. physical travel or e-communication). The different modalities create different social networks. Each network represents a particular flow of potential activity travel generated by interaction between the individuals. These networks have been clustered on the basis of their C/. T balance to get distinct people{\textquoteright}s profiles that can be used to target transport and ICT policies better. {\textcopyright} 2011 Elsevier Ltd.},
	issn = {0966-6923},
	doi = {10.1016/j.jtrangeo.2011.09.005},
	author = {Roy, P and Mart{\'\i}nez, AJ and Miscione, G and Zuidgeest, MHP and van Maarseveen, MFAM}
}
@conference {roy2011clusteringcharacteristics,
	title = {Clustering people based on their social network, locational and socio-demographic characteristics},
	year = {2011},
	author = {Roy, P and Mart{\'\i}nez, AJ and Miscione, G and Zuidgeest, MHP}
}
