ALBRECHT, Ulrich. “A-Whitehead Groups”. Studia Universitatis Babeș-Bolyai Mathematica 60, no. 1 (March 30, 2015): 19–29. Accessed September 1, 2025. https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5654.