GLIMMPSE is described in:
Glueck, D. H., Li, Q., Macleod, A. J., Litkowski, E. M., Yang, X., Bian, J., Ritzhaupt, A. D., Sommer, M., Valle, N., Shaw, J. R., & Muller, K. E. (2025). Power and sample size for reversible linear mixed models with clustering and longitudinality: GLIMMPSE Version 3. PloS One, 20(9), e0329712. https://doi.org/10.1371/journal.pone.0329712
In addition, you may cite the RRID for GLIMMPSE, which is SCR_016297.