
https://www.nber.org/system/files/working_papers/w23583/w23583.pdf

https://ecipe.org/wp-content/uploads/2025/12/ECI_25_PolicyBrief_20-2025_Openess_LY06.pdf

https://www.occrp.org/en/daily/11936-russian-ventilator-suppliers-may-be-conspiring-to-avoid-competition