Gawlicki, Marek. “Applicability of Blended Cements and Mineral Additives in the Production of Concrete Mix for Precast Manhole Covers”. Roads and Bridges – Drogi i Mosty 8, no. 1 (February 2, 2016): 41–71. Accessed April 18, 2025. https://rabdim.pl/index.php/rb/article/view/v8n1p41.