A. Yu. Zaitsev, “Multidimensional version of a result of Sakhanenko in the invariance principle for vectors with finite exponential moments. I”, Теория вероятн. и ее примен., 45:4 (2000), 718–738 ; A. Yu. Zaitsev, “Multidimensional version of a result of Sakhanenko in the invariance principle for vectors with finite exponential moments. I”, Theory Probab. Appl., 45:4 (2001), 624–641