bi onyane. GNU Octave - open soorce version o MATLAB bi MathWorks LaTeX LibreOffice MediaWiki OpenBSD OpenDocument OpenStreetMap SATySFi Scilab Facebook
project on environmental risk management in the Volga Basin Archived 2020-11-24 at the Wayback Machine Geografic data relatit tae Volga at OpenStreetMap
Retrieved 25 Apryle 2007. Geografic data relatit tae Lawer Saxony at OpenStreetMap Offeecial govrenmental portal Archived 2005-03-08 at the Wayback Machine