UNGUREANU, G., L. PISTOL, and A. VÂRGĂ. “The Joint Commercial Operations As a Tool of Avoiding of Liquidities in the Current Crisis Context”. Annals of Spiru Haret University. Economic Series, vol. 10, no. 1, Mar. 2010, pp. 121-30, https://anale.spiruharet.ro/economics/article/view/10113.