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...trix, and thus, avoid computing Choleksy factorizations. Like with [4], there are potential stability issues that are not addressed regarding inverting the M ×M matrix. Finally, Apostolopoulou et al. =-=[2, 1]-=- derive a closed-form expression for (B + σI)−1 to solve the first equation in (2). The authors are able to explicitly compute the eigenvalues of THE MSS METHOD 3 B, provided M = 1 [2, 1] or M = 2 [1]...