Wook Hyun Kwon, Yong-Gi Park, Jae Hyung Roh, Jong-Bae Park, Duehee Lee, 2019, Calculating
the Benefit of Distributed Combined Heat Power Generators from Avoiding a Transmission
Expansion Cost by Solving a Mixed Integer Linear Programming, The transactions of
The Korean Institute of Electrical Engineers, Vol. 68, No. 4, pp. 513-522