Grin, Y. N., Gladyshevsky, R. E., Sichevich, O. M., Zavodnik, V. E., Yarmolyuk, Y. P., & Rozhdestvenskaya, I. V. (1984). Crystal structure of R2Ga9Co3 compounds (R=Nd, Sm, Gd, Y, Tb, Dy, Ho, Er, Tm, Yb, Lu). Kristallografiya, 29(5), 893-898.