1. Cardarelli, F.: Scientific unit conversion Creator: Šesták, Z. Format: bez média and svazek Type: model:article and TEXT Subject: metric system Language: Multiple languages Rights: http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
2. Witold Kula, Miary a ludzie Creator: Kramařík, Jaroslav Format: bez média and svazek Type: model:article and TEXT Subject: ethnography, history of metrology, and metric system Language: Czech Rights: http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public