Regional environmental GIS "Ida-Virumaa" : air pollutantsKundel, Helmut; Liblik, Valdo; Rätsep, AavoGIS-Baltic Sea States '95 : exhibition, conference - Tallinn, Estonia, 13-15 December, 1995 : abstracts, catalogue1995 / p. 28

The imitation system for assessment of the formation of multicomponent air pollution levelLiblik, Valdo; Kundel, Helmut; Rätsep, AavoGIS-Baltic Sea States '93 : exhibition, conference, Tallinn, Estonia, 29 November - 1 December : proceedings1994 / p. 131-138

The imitation system for assessment of the formation of multicomponent air pollution levelKundel, Helmut; Liblik, Valdo; Rätsep, AavoGIS-Baltic Sea States '93 : exhibition, conference, Tallinn, Estonia, 29 November - 1 December 1993 : abstract book, catalogue1993 / p. 40

Õhukeskkonna seisundi hinnang imitatsioonisüsteemi abilKundel, H.; Liblik, ValdoXVI Eesti keemiapäevad : teaduskonverentsi ettekannete referaadid = 16th Estonian chemistry days : abstracts of scientific conference1995 / lk. 59-61