https://www.dgb-bestellservice.de/besys_dgb/pdf/DGB15130.pdf
https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/earningsandworkinghours/articles/contractsthatdonotguaranteeaminimumnumberofhours/may2017
https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/fs-na80-2019-autonomie-collectivites-final.pdf
https://static.europeanchamber.com.cn/upload/documents/documents/The_Digital_Hand_How_China_s_Corporate_Social_Credit_System_Conditons_Market_Actors[709].pdf