Below is a link to the PDF version of the study titled “Top Level Domain Bias in Search Engine Indexing and Rankings”. If you have any questions or comments, feel free to get in touch.
Top Level Domain Bias in Search Engine Indexing and Rankings, January 2020
https://drive.google.com/open?id=1zkCXH2MZuN4Z_eBszGPW5QC5mqJbIE8o