@article{bcm-cins-15
, author = "Burton, Benjamin A. and Colin de Verdi{\`e}re, {\'E}ric and de Mesmay, Arnaud"
, title = "On the complexity of immersed normal surfaces"
, journal = "Geometry \& Topology"
, volume = 20
, pages ="1061--1083"
, year = 2015
}