Acoustic study on motorcycle helmets with application of novel porous materialLavrentjev, Jüri; Rämmal, HansSAE Technical Paper Series : The 25th Small Engine Technology Conference (SETC2019) : Small Powertrains–Innovating for Their Future Role, International Conference Center Hiroshima, November 19-21, 2019 : Final program2020 / Paper 2019-32-0531, p. 1-7 : ill https://www.sae.org/publications/technical-papers/content/2019-32-0531/ http://www.setc-jsae.com/2019docs/SETC2019_FinalProgram_all.pdf Conference proceedings at Scopus Article at Scopus Mootorratturile võib põrkepiire olla elu ja surma küsimusKask, MihkelTeeleht2019 / lk. 42-43 : fot https://www.mnt.ee/sites/default/files/road_paper_pdf/teeleht_98_veeb.pdf https://www.ester.ee/record=b1073043*est https://digikogu.taltech.ee/et/Item/28eba9c0-f81f-4ff4-97c2-0beff30aff4e Motorcyclist's helmet noise attenuationKortesuo, Antti; Kaivola, RistoProceedings of the International EAA/EEAA Symposium : Transport Noise and Vibration, Tallinn, 8.06 - 10.06. 19981998 / p. 189-192: ill