P. Hakala, O. Orell, E. Sarlin, E. Pääkkönen, L. Jutila, ja 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, vsk. 56, nro 1, ss. 24–40, touko 2023.