Ping Huang Yao Zhang Yongqiang Liu The O(epsilon)-Correction to Boundary of Stability Region for Multi-time Scale Power Systems. 608-615 2007 conf/icic/2007-1 ICIC (1) http://dx.doi.org/10.1007/978-3-540-74171-8_60 db/conf/icic/icic2007-1.html#HuangZL07