Retraction Note to: Netw Spat Econ (2018) 18:1019–1026

https://doi.org/10.1007/s11067-017-9373-y

The Editor-in-Chief has retracted this article (Marković 2018) because validity of the content of this article cannot be verified. This article showed evidence of authorship manipulation. The author does not agree to this retraction.