Leser, C. E. V. (1961). "A Simple Method of Trend Construction". Journal of the Royal Statistical Society. Series B (Methodological). 23 (1): 91–107. doi:10.1111/j.2517-6161.1961.tb00393.x. JSTOR2983845.
Leser, C. E. V. (1961). "A Simple Method of Trend Construction". Journal of the Royal Statistical Society. Series B (Methodological). 23 (1): 91–107. doi:10.1111/j.2517-6161.1961.tb00393.x. JSTOR2983845.