ICON : the journal of the international committee for the history of technology2023 https://www.icohtec.org/icon/volume-28-issue-1-2023/ Metallid - materjaliringluse liidridKübarsepp, JakobPostimees2024 / Lk. 8 https://dea.digar.ee/article/postimees/2024/02/10/11.3