K. Agarwal, C. Dixon, E. Rozner, and J. Carter. Proceedings of the Third Workshop on Hot Topics in Software Defined
Networking, page 157--162. New York, NY, USA, ACM, (2014)
H. Yang, C. Xu, X. Ma, L. Zhang, C. Cao, and J. Lu. Proceedings of the 2012 IEEE 36th Annual Computer Software and Applications Conference, page 632--637. Washington, DC, USA, IEEE Computer Society, (2012)
W. Duch, and G. Diercksen. The Journal of Chemical Physics, 101 (4):
3018-3030(August 1994)Multi-reference form of the Davidson correction given here..