- Huang Wei-hong, Shen You-gen, “Quantum cosmology with conformal scalar field in the Vilenkin theory”, Chinese Astronomy and Astrophysics, 16, no. 2, 1992, 124
- Zhen-Qiang Tan, You-Gen Shen, “Wormholes and large-scale topology of the Universe”, Nuovo Cim B, 111, no. 12, 1996, 1433
- M. Gasperini, G. Ummarino, “Adiabatic perturbations and minimal size of the de Sitter vacuum”, Physics Letters B, 266, no. 3-4, 1991, 275
- Irina Aref’eva, Igor Volovich, “Gas of Baby Universes in JT Gravity and Matrix Models”, Symmetry, 12, no. 6, 2020, 975
- M.D. Pollock, “On the zero-action hypothesis in the theory of wormholes”, Nuclear Physics B, 355, no. 1, 1991, 133