1. Profile of system and product certification as quality infrastructure in Indonesia
2. M. Kellermann, Comprehensive Diagnostic Tool: Annex to the QI Toolkit. International Development in Practice, (International Bank for Reconstruction and Development / The World Bank and Physikalisch-Technische Bundesanstalt (PTB), Washington DC (US), 2019).
3. The World Bank Group and PTB, “Quality Infrastructure Assessment Report of Ethiopia”, Physikalisch-Technische Bundesanstalt, April (2020)
4. The World Bank Group and PTB, “Quality Infrastructure Assessment Report of Rwanda”, Physikalisch-Technische Bundesanstalt, June (2020)
5. M. Kellermann, Ensuring Quality to Gain Access to Global Markets: A Reform Toolkit. International Development in Practice, (International Bank for Reconstruction and Development / The World Bank and Physikalisch-Technische Bundesanstalt (PTB), Washington DC (US), 2019).