potter https://rodneywhitecenter.wharton.upenn.edu/wp-content/uploads/2014/03/8317.pdf
https://www.tias.edu/docs/default-source/Kennisartikelen/ssrn-id2154873.pdf
https://theses.lib.polyu.edu.hk/handle/200/45?mode=full
https://www.jstor.org/stable/10.1086/430862?seq=3
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"The Almanac of Stock Market Seasonality"
"Seasonal Stock Market Trends: The Definitive Guide to Calendar-Based Stock Market Trading"