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Author: Krall, Allan M.

• Brown, Richard C.; Krall, Allan M.: $n$-th order ordinary differential systems under Stieltjes boundary conditions. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 1, pp. 119-131
• Brown, Richard C.; Krall, Allan M.: On minimizing the sum of squares of $\Cal L^2$ norms of differential operators under constraints. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 1, pp. 132-143