Carstairs, I.R., Court, A.J., Dean, A.J., Dipper, N.A., Gorrod, M.J., Lewis, R.A., Bazzano, A., Maggioli, P.P., Perotti, F., Quadrini, E., "Kernel density estimators applied to fast timing hard X-ray observations of the Crab pulsar", Advances in Space Research, 1991