Retracted papers originating from paper mills: cross sectional study
BMJ (2022) - Comments
doi: 10.1136/bmj-2022-071517  issn: 1756-1833  pubmed: 36442874 

Cristina Candal-Pedreira, Joseph S Ross, Alberto Ruano-Ravina, David S Egilman, Esteve Fernández, Mónica Pérez-Ríos