A. I. Perepelkin, V. B. Mandrikov, A. I. Krayushkin, A. B. Doronin, and O. V. Matveeva, “Characteristics of finger indices of hand 1D:3D and 2D:4D in dependence on gender and type of the constitution”, IJET, vol. 7, no. 2.23, pp. 137–139, Apr. 2018, doi: 10.14419/ijet.v7i2.23.11902.