P. Hakala, O. Orell, E. Sarlin, E. Pääkkönen, L. Jutila, and M. Kanerva, “Durability of sandwich structures with a maximized natural raw material basis: comparison of expanded polystyrene, cellulose foam and polylactic acid subjected to UV-rain aging”, RakMek, vol. 56, no. 1, pp. 24–40, May 2023.