"Non-cognitive differences between abacus-trained students and their counterparts"
https://www.sciencedirect.com/science/article/abs/pii/
"Does the Japanese abacus improve underachieving children's performance in mathematics?"
https://bsrlm.org.uk/wp-content/uploads/2016/02/
"Effects of Abacus training on the intelligence of Sudanese children"
https://www.researchgate.net/publication/247167127_Effects_of_Abacus_training_on_the_intelligence_of_Sudanese_children
https://files.eric.ed.gov/fulltext/EJ1288634.pdf
"Assessment of auditory working memory in children with abacus training"
https://link.springer.com/article/10.1007/s00405-020-05840-z
https://pubmed.ncbi.nlm.nih.gov/18985348/
"Working Memory Underpins Cognitive Development, Learning and Education"
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4207727/
"Enhanced white matter tracts integrity in children with abacus training"
https://pubmed.ncbi.nlm.nih.gov/20235096/
http://www.shuzan.jp/english/brain/brain.html
"The Impact of Early Math and Numeracy Skills on Academic Achievement in Elementary School"
https://nwcommons.nwciowa.edu/cgi/viewcontent.cgi?article=1145&context=education_masters
