The following sources are referenced in Essential Graphing.
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Rousseeuw, P. J., Ruts, I., and Tukey, J. W. (1999). “The Bagplot: A Bivariate Boxplot.” The American Statistician 53: 382 - 387.
Wegman, E. J. (1990). “Hyperdimensional Data Analysis using Parallel Coordinates.” Journal of the American Statistical Association 85: 664–675.