Robuta

https://www.uantwerpen.be/en/centres/centre-expertise-higher-education/didactic-information/teaching-tips/assessing-students/oral-tests-objectivity/

https://www.ets.org/research/policy_research_reports/publications/article/1955/ibhs.html

https://www.studylib.net/doc/5451397/nature-of-objective-test-items-and-resources

https://www.uwlax.edu/catl/guides/teaching-improvement-guide/how-can-i-improve/objective-tests/