Beyond the mega-data center: networking multi-data center regions. - Vojislav Dukic; Ginni Khanna; Christos Gkantsidis; Thomas Karagiannis; Francesca Parmigiani; Ankit Singla; Mark Filer; Jeffrey L. Cox; Anna Ptasznik; Nick Harland; Winston Saunders; Christian Belady (SIGCOMM, 2020)