Royston, J.P.: An Extension of Shapiro and Wilk' s W Test for Normality to Large Samples. Applied Statistics 31(2),(1982)
Royston, J.P.: Some Techniques for Assessing Multivarate Normality Based on the Shapiro Wilk W. Journal of the Royal Statistical Society. Series C (Applied Statistics) 32(2), (1983)
Royston, J.P.: Approximating the Shapiro Wilk W Test for non normality. Statistics and Computing 2(3), (1992)
Royston, J.P.: Remark AS R94: A remark on Algorithm AS 181: The W test for normality. Journal of the Royal Statistical Society. Series C (Applied Statistics) 44(4), (1995)