1. Institute of the Built Environment and Spatial Policy, University of Lodz, 90-142 Lodz, Poland
2. Department of Civil & Environmental Engineering, Florida A&M University-Florida State University (FAMU-FSU), Tallahassee, FL 32310, USA
3. Institute of Mathematics, Lodz University of Technology, 93-590 Lodz, Poland
4. Research Center for European Spatial Policy and Local Development, University of Lodz, 90-142 Lodz, Poland