G.J. Boekschoten, A.C. Van der Raad, J.A.M. Kenter, and J.J.G. Reymer. 1988. “Note on a Mid-Proterozoic Stromatolite Limestone, South of Grythyttan, Bergslagen, Sweden”. Netherlands Journal of Geosciences, January, 467-69. https://njgjournal.nl/index.php/njg/article/view/13083.