Unit problem text published in JOS January 03, 2019

van Delden, A., Lorenc, B., Struijs, P. and Zhang, L.-C. (2018). Letter to
the Editor: On statistical unit errors in business statistics. Journal of
Official Statistics 34, 573-580.
Link:
https://content.sciendo.com/view/journals/jos/34/2/article-p573.xml