Hurtado, C.A. and Poulovassilis, Alexandra and Wood, Peter T. (2009) Finding Top-k approximate answers to path queries. In: Andreasen, T. and Yager, R.R. and Bulskov, H. and Christiansen, H. and Larsen, H.L. (eds.) Flexible Query Answering Systems. Lecture Notes In Computer Science 5822. Berlin, Germany: Springer, pp. 465-476. ISBN 9783642049569.