NasedkinaYa. S. 2016. “Conditions for a Submanifold $F^n$ from $E^{n + p}$ to Lie in $E^{2n − 1}$”. Ukrains’kyi Matematychnyi Zhurnal 68 (3), 357-62. http://umj.imath.kiev.ua/index.php/umj/article/view/1843.