Fileva, Petya. “Failing to Plan Is Planning to Fail - The Importance of Planning Phase in Logistics Outsourcing, 2 Cases from Bulgaria”. Research Papers, no. 2 (August 2, 2020): 197–206. Accessed July 22, 2026. https://bjiep.e-dnrs.org/index.php/rp/article/view/5385.