12 citations to https://www.mathnet.ru/rus/tm930
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Agrachev A.A., Stefani G., Zezza P., “Strong optimality or a bang-bang trajectory”, SIAM Journal on Control and Optimization, 41:4 (2002), 991–1014
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Agrachev A., Stefani G., Zezza P., “An invariant second variation in optimal control”, International Journal of Control, 71:5 (1998), 689–715