UT Dallas school of managment has this tool available on their site
http://citm.utdallas.edu/utdrankings/rankingbydate.aspx
basically, it counts up publications from the journals listed , by school, by author, or whatever else u like
click on the journals that are applicable for ur field, and see what it spits out
gives u a rough idea of the research output, but only in the selected journals,
vague idea of research output is better than goin off of usnews mba rankings