1. M. G. Kendall defines the serial correlations of orderkfor finite series as corresponding to autocorrelations of infinite series. See: “Contributions to the study of oscillatory time series,” Occasional Papers IX, National Institute of Economic and Social Research, Cambridge, 1946. This paper also contains important references to earlier works of Yule and others.
2. See: Maurice G. Kendall,The Advanced Theory of Statistics, (London, 1948), Vol. II. Publisher: Charles Griffin and Company, Limited, 42 Drury Lane.