Runkel, Ingo, and Lorant Szegedy. “Area-Dependent Quantum Field Theory.”https://doi.org/10.1007/s00220-020-03902-1__Communications in Mathematical Physics. Springer Nature, 2021.https://doi.org/10.1007/s00220-020-03902-1 .

Kalinin, Nikita, and Mikhail Shkolnikov. “Sandpile Solitons via Smoothing of Superharmonic Functions.”https://doi.org/10.1007/s00220-020-03828-8__Communications in Mathematical Physics. Springer Nature, 2020.https://doi.org/10.1007/s00220-020-03828-8 .