Danilin, A. R.; Kovrizhnykh, O. O. Time-optimal control of a small mass point without environmental resistance. (English. Russian original) Zbl 1276.49003 Dokl. Math. 88, No. 1, 465—467 (2013); translation from Dokl. Akad. Nauk, 451, No. 6, 612—614 (2013). MSC: 49J15 49K15 34H05 70Q05