Freutel, S., Rameau, J. D., Rettig, L., Avigo, I., Ligges, M., Yoshida, Y., Eisaki, H., Schneeloch, J., Zhong, R. D., Xu,
Z. J., Gu, G. D., Bovensiepen, U., & Johnson, P. D. (2019). Optical perturbation
of the hole pockets in the underdoped high-Tc superconducting cuprates. Physical Review
B, 99(8):. doi:10.1103/PhysRevB.99.081116.