Maliene V, Grigonis V, Palevičius V, Griffiths S (2011). "Geographic information system: Old principles with new capabilities". Urban Design International. 16 (1): 1–6. doi:10.1057/udi.2010.25. S2CID110827951.
Maliene V, Grigonis V, Palevičius V, Griffiths S (2011). "Geographic information system: Old principles with new capabilities". Urban Design International. 16 (1): 1–6. doi:10.1057/udi.2010.25. S2CID110827951.