Hopkins, M. T. (2013). Teachers’ Practices and Beliefs Regarding Teaching Tuning in Elementary and Middle School Group String Classes. Journal Of Research In Music Education, 61(1), 97-114. doi:10.1177/0022429412473607

Not very relevant to my topic. Still, some knowledge about strings in group: children have problems with tuning in a group setting and teachers often feel they are not instructed to teach that. At the same time only 33% uses electronic tuners. It seems to take 4.5 years to obtain the necessary tuning skills.