MathSciNet bibliographic data MR753956 (85i:65101) 65L10 (34B15) Schröder, Johann Numerical error bounds for fourth order boundary value problems, simultaneous estimation of $u(x)$$u(x)$ and $u\sp{\prime\prime}(x)$$u\sp{\prime\prime}(x)$. Numer. Math. 44 (1984), no. 2, 233–245. Article

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