Here are a few which are relevant:
"Code Review Metrics". [0]
"A Large-Scale Study of Programming Languages and Code Quality in Github". [1]
"Software Quality Metrics". [2]
"Study on the Correlations Between Program Metrics and Defect Rate by a Controlled Experiment". [3]
0 - https://www.owasp.org/index.php/Code_Review_Metrics
1 - https://cacm.acm.org/magazines/2017/10/221326-a-large-scale-...
2 - https://www.developer.com/tech/article.php/10923_3644656_2/S...