https://www.researchgate.net/publication/310749349_Risk_Evaluation_for_Hybrid_Excitation_Compulsator?_sg=3ki8pap-0OyV13sYzuSbKQUdLf4aa8MH_x6MGjak_zYhjo2JP6SW7dcldPryf4LeXVtq8uJrhCySeYao5RhMU7CTUqym3GCi3A
