CHRZANOWSKA, M.; DREJERSKA, N.; POMIANEK, I. AN ATTEMPT TO DETERMINE THE FUNCTIONAL AREA OF WARSAW WITH THE USE OF THE MEASURE OF RELATIVE DEVELOPMENT LEVEL AND HELLWIG'S MEASURE. Acta Scientiarum Polonorum. Oeconomia, v. 12, n. 1, p. 5-15, 30 Mar. 2013.