Duan S., Nouaili N., Zaag H. (2025), Standing-sphere blow-up solutions for the nonlinear heat equation, Discrete and Continuous Dynamical Systems. Series A, vol. 45, n°5, p. 1434-1453 
Duan S., Nouaili N., Zaag H. (2024), Collapsing-ring blowup solutions for the nonlinear heat equation, Paris, Cahier de recherche CEREMADE, Université Paris Dauphine-PSL, 25 p.