Mika Liukkonen, Heikki Mutikainen, Jari Käyhkö, Kari Peltonen, and Yrjö Hiltunen. 2015. “Approach for Online Characterization of Bubbles in Liquid by Image Analysis: Application to Oxygen Delignification Process”. International Journal of Computer Information Systems and Industrial Management Applications 7 (January):8. https://cspub-ijcisim.org/index.php/ijcisim/article/view/300.