Kalaitzopoulos, Stylianos, Enzo Mangano, Hai Nguyen, and Stefano Brandani. “Shell-Core Structure in Commercial Pellets Detected Using the Zero Length Column Technique”. Diffusion Fundamentals 35 (November 3, 2022). Accessed June 3, 2025. https://diffusion.publia.org/diffusion/article/view/1189.