Milićević, N., A. Grubor, N. Đokić, and G. Avlijaš. “Retail Out-of-Stocks in the Context of Centralized and Direct Delivery”. Promet - Traffic&Transportation, Vol. 30, no. 1, Mar. 2018, pp. 105-14, doi:10.7307/ptt.v30i1.2466.