Budsaba, Kamon, Saengla Chaimongkol, Shauneen Pete, Arzu Sardarli, and Andrei Volodin. 2015. “Estimation of Prosperity and Depression Periods in a Labour Market”. Thailand Statistician 6 (2):163-72. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/34330.