Aziz, Fayeem, Arof, Hamzah, Mokhtar, Norrima, Shah, Noraisyah M., Khairuddin, Anis S. M., Hanafi, Effariza, Talip, Mohamad Sofian Abu. Public Library of Science (PLoS); 2018. Waste level detection and HMM based collection scheduling of multiple bins.