Deliberate practice and performance in music, games, sports, education, and professions: a meta-analysis
Psychological Science (2014) - Comment
pubmed: 24986855  doi: 10.1177/0956797614535810  issn: 1467-9280  issn: 0956-7976 

Brooke N. Macnamara, David Z. Hambrick, Frederick L. Oswald