Website:
https://talantiuspeh.webex.com/talantiuspeh-ru/j.php?MTID=md687fd9e36b8f55e0b4de1efe6e497ae
References
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S. G. Basalaev, S. K. Vodopyanov, “Approximate differentiability of mappings of Carnot–Carathéodory spaces”, Eurasian Math. J., 4:2 (2013), 10–48
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A. V. Greshnov, “Dokazatelstvo teoremy Gromova ob odnorodnoi nilpotentnoi approksimatsii dlya vektornykh polei klassa $C^1$”, Matem. tr., 15:2 (2012), 72–88
   ; Siberian Adv. Math., 23:3 (2013), 180–191  -
M. Gromov, “Approximate differentiability of mappings of Carnot–Carathéodory spaces”, Sub-Riemannian geometry, Progress in Mathematics, 144, Birkhäuuser, Basel, 1996
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A. Greshnov, “Optimal Horizontal Joinability on the Engel Group”, Atti Accad. Naz. Lincei Rend. Lincei Mat. Appl., 2021 (to appear)
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