1. Dioptra, a. s. Turnov - Dioptra CZ a. s. Creator: Karmášek, Josef Format: bez média and svazek Type: model:article and TEXT Language: Czech Rights: http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
2. Rozvojový program Dioptry a.s. Turnov Creator: Karmášek, Josef Format: bez média and svazek Type: model:article and TEXT Language: Czech Rights: http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public