[1]https://www.nature.com/articles/s41467-022-30783-w
[2]https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.030401
[3]https://www.nature.com/articles/s41563-020-0780-y
[4]https://www.iflscience.com/physics/impossible-time-crystal-system-could-hold-secret-to-quantum-computing-revolution/