This work followed on the AERA OPEN 2016 paper.
This was presented at SREE (SREE Program).
Rigor and Relevance in an Efficacy Study of an Online Mathematics Homework Intervention
Jeremy Roschelle*, Robert Murphy, & Mingyu Feng, SRI International, Craig Mason & Janet Fairman, University of Maine
They made their Report and Slides available. Of note is slide #19 showing the size of the effect was about one full grade level equivalent.