@article {Direct1965,
title = {Direct Estimation of Seasonal Variation},
year = {1965},
notes = {https://doi.org/10.2307/1401256},
url = {https://www.esri.ie/publications/direct-estimation-of-seasonal-variation-2},
author = {Leser, Conrad},
journal = {Revue de l'Institut International de Statistique / Review of the International Statistical Institute

Vol. 34, No. 3, 1966, pp. 369-375},
}