Effective Poroelastic Properties of N-Layered Composite Sphere Assemblage with Imperfect Interface: Application to Oolitic Rocks - Thi Thu Nga Nguyen; Ngoc Bien Nguyen; Minh Ngoc Vu; Tuan Nguyen-Sy; Duc Tho Pham; Nam Hung Tran (Rock Mechanics and Rock Engineering, 2026)