The present chapter is based on a notebook with concise descriptions of children seen at the Donskaya Clinic. The notebook has a leatherette cover with 36 pages, and the notes were written in violet ink. Stuck on the front cover was a piece of paper with the penciled text "About volition." L.E. Tuzovskaya helped with the first deciphering of the text.
van der Veer, R. (2018)., Difficult children, in E. Zavershneva & R. Van Der Veer (eds.), Vygotsky's notebooks, Dordrecht, Springer, pp. 437-458.
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