Teirumnieka, Ērika, et al. “The Analytical Solution of the 3D Model With Robin’s Boundary Conditions for 2 Peat Layers”.
ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, vol. 3, June 2015, pp. 186-92,
https://doi.org/10.17770/etr2015vol3.618.