Bravalheri, Anderson; Muqaddas, ABUBAKAR SIDDIQUE; Uniyal, Navdeep; Casellas, Ramon; Nejabati, Reza; Simeonidou, Dimitra, VNF Chaining across Multi-PoPs in OSM using Transport API, in: Proceedings of The Optical Networking and Communication Conference & Exhibition (OFC), 2019