Energy efficient optimal parent selection based routing protocol for Internet of Things using firefly optimization algorithm - Sennan, Sankar; Somula, Ramasubbareddy; Luhach, Ashish K.; Deverajan, Ganesh Gopal; Alnumay, Waleed; Jhanjhi, N. Z.; Ghosh, Uttam; Sharma, Pradip (Transactions on emerging telecommunications technologies, 2021)