Staykov, Vladimir. “The Necropolises of ‘Cherna–Sihleanu’ Type: Are They Biritual and What in Fact Does Biritualism Mean?”. Bulgarian e-Journal of Archaeology | Българско е-Списание за Археология 12, no. 1 (June 10, 2022): 117–131. Accessed November 26, 2022. https://be-ja.org/index.php/journal/article/view/265.