https://research.ibm.com/publications/raman-measurements-of-the-superconductor-lalessinfgreater2-xlessinfgreatersrlessinfgreaterxlessinfgreatercuolessinfgreater4lessinfgreater
Raman measurements of the superconductor (La2-xSrx)CuO4 for Solid State Communications - IBM...
https://impact.ornl.gov/en/publications/impurity-effect-on-spin-correlations-in-lightly-doped-lasub2-xsub/
Impurity effect on spin correlations in lightly doped La2 - x Srx CuO4 - Oak Ridge National...
https://webbook.nist.gov/cgi/cbook.cgi?ID=B1003894
CuO4-