@article{Hewitt1971,
author = {Hewitt, D. and Milner, J. and Csima, A. and Pakula, A.},
title= {On Edwards’ criterion of seasonality and a non-parametric alternative},
year = {1971},
doi = {10.1136/jech.25.3.174},
volume = {25},
number = {3},
pages = {174--176},
}