ReCVisu: A tool for clustering-based visual exploration of requirements. - Sandeep Reddivari; Zhangji Chen; Nan Niu (RE, 2012)

Departures from optimality: understanding human analyst's information foraging in assisted requirements tracing. - Nan Niu; Anas Mahmoud 001; Zhangji Chen; Gary Bradshaw (ICSE, 2013)

Keeping requirements on track via visual analytics. - Nan Niu; Sandeep Reddivari; Zhangji Chen (RE, 2013)