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Base map of the natural resources - fundamental map of GISKask, Rein; Viru, Rein; Potter, HeikkiGIS-Baltic Sea States '93 : exhibition, conference, Tallinn, Estonia, 29 November - 1 December 1993 : abstract book, catalogue1993 / p. 72-73

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On conformal geospatial transformations with complex polynomialsLippus, Jüri; Oja, TõnuProceedings of the Estonian Academy of Sciences2012 / p. 65-70 : ill https://www.kirj.ee/public/proceedings_pdf/2012/issue_1/Proc-2012-1-65-70.pdf

The base map of natural resources of EstoniaKask, Rein; Viru, Rein; Potter, HeikkiGIS-Baltic Sea States '93 : exhibition, conference, Tallinn, Estonia, 29 November - 1 December : proceedings1994 / p. 287-293: ill