"1975Z"^^ . . "1975-12-10Z"^^ . . . . . "Johan Peter Holtsmark"@en . . . "Johan Peter Holtsmark (February 13, 1894 \u2013 December 10, 1975) was a Norwegian physicist, who studied spectral line broadening and electron scattering. In 1929, while at the Norwegian Institute of Technology, Holtsmark established acoustics research laboratories, focusing on architectural acoustics and sound insulation."@en . "1894Z"^^ . . . "Holtsmark, Johan Peter"@en . "1894-02-13Z"^^ . "Norwegian physicist" . .