Laaksonen, Seppo, Teemu Kemppainen, Matti Kortteinen, Mats Stjernberg, Mari Vaattovaara, and Henrik Lönnqvist. 2015. “Tackling City-Regional Dynamics into a Survey Using Grid Sampling”. Survey Research Methods 9 (1):45-55. https://doi.org/10.18148/srm/2015.v9i1.5832.