add bibliography of "Revisiting routing control platforms [...]" from SIGCOMM 2012
add bibliography of "Can the production network be the testbed?" from proceedings of the 9th USENIX conference
improve bibliography of "OpenFlow: enabling innovation in campus networks", from dl.acm.org
add bibliography of "Flowvisor: A network virtualization layer"
add bibliography of "Where is the debugger for my software-defined network?"