academic research

I am undertaking econometric research on the effect of whether an increase in marketing expense leads to a higher return on capital invested for a business, driving not only real profits on the company financial statements, but also delivering shareholder value through increased asset pricing.

i need someone with experience in econometrics analysis to review other research on the topic. critically reviewing at least 7 articles on the subject. Noting the findings, methods used, area's of improvement and flaws in the research.