M. . Celewicz, M. . Niziol-celewicz, y N. . Popescu, «Relations between Poland and its Eastern Neighbours after the 1999 NATO Enlargement», UNISCI discuss. pap., n.º 10, pp. 221–245, ene. 2006, Accedido: nov. 25, 2024. Disponible en: https://revistas.ucm.es/index.php/UNIS/article/view/UNIS0606130221A