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BIT Numerical Mathematics > 2019 > 59 > 2 > 523-545
IEEE Transactions on Power Systems > 2016 > 31 > 6 > 4483 - 4494
Linear Algebra and its Applications > 2016 > 507 > C > 486-498
Linear Algebra and Its Applications > 2011 > 434 > 7 > 1716-1732