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• Control of p-type conductivity in CdTe by CdCl2 vapor phase treatmentHiie, Jaan; Valdna, VelloProc. Euromat '99. Vol. 132000 / p. 261-266
• Experimental studies of ZnS-based phosphorsValdna, Vello; Durst, R.; Mere, ArvoProc. Euromat '99. Vol. 132000 / p. 117-120