Robuta

https://www.dealnews.com/products/Blue-Wave/Blue-Wave-48-Peel-and-Stick-Above-Ground-Pool-Cove-Foam-19-Pack/492082.html

https://www.bas.ac.uk/data/our-data/publication/analysis-of-the-effectiveness-of-ground-based-vlf-wave-observations-for/

https://www.nist.gov/publications/attenuation-ground-wave-low-frequency-electromagnetic-pulse

https://www.nist.gov/publications/ground-wave-attenuation-function-spherical-earth-witharbitrary-surface-impedance-radio

https://www.arxiv.org/abs/1402.0055

https://www.dummies.com/article/academics-the-arts/science/quantum-physics/how-to-find-the-wave-function-of-the-ground-state-of-a-quantum-oscillator-161728/