1. Harmonic Analysis of Seasonal Variation with an Application to Hog Production;Abel;Journal of American Statistical Association,September, 1962
2. Cycles in Production and Prices of Hogs in Canada and United States, 1953 to 1967;Boswell;Canadian Farm Economics,August, 1968
3. Harmonic Analysis of Seasonal Data: Some Important Properties;Doran;American Journal of Agricultural Economics,November, 1972