求论文两篇

1. R. S. Singh，Nonparametric Estimation of Derivatives of Average of $\mu $-Densities with Convergence rates and Applications，SIAM J. Appl. Math., 35(4), 637–649.  http://epubs.siam.org/doi/abs/10.1137/0135053

2.   Singh R S. Mean squared errors of estimates of a density and its derivatives，Biometrika (1979) 66 (1): 177-180.
http://biomet.oxfordjournals.org/content/66/1/177.full.pdf+html

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