1. Origin of the Proton Mass
2. Gap Equation Models for Chiral Symmetry Breaking
3. Wilczek, F. (2003) MIT Physics Annual. https://physics.mit.edu/wp-content/uploads/2021/01/physicsatmit_03_wilczek_originofmass.pdf
4. The cosmological constant problem
5. Margan, E. (2012) Estimating the Vacuum Energy Density—An Overview of Possible Scenarios. Jozef Stefan Institute, Ljubljana.