Freire, Maria Raquel. «Ukraine´s Multi-Vectorial Foreign Policy: Looking West While Not Overlooking Its Eastern Neighbor». UNISCI Discussion Papers, no. 20 (enero 1, 2009): 232–249. Accedido febrero 2, 2026. https://revistas.ucm.es/index.php/UNIS/article/view/UNIS0909230232A.