@ARTICLE{
author={Ralevic Predrag V,Dobrodolac Momcilo,Markovic Dejan,Finger Matthias},
year={2014},
title={Stability of the Classifications of Returns to Scale in Data Envelopment Analysis: A Case Study of the Set of Public Postal Operators},
journal={ACTA POLYTECHNICA HUNGARICA},
volume={11},
number={8},
pages={177-196},
document_type={Article},
}