. . . . "1985Z"^^ . "Koopmans, Tjalling Charles"@en . . . "Tjalling Charles Koopmans (August 28, 1910 \u2013 February 26, 1985) was a Dutch American mathematician and economist, the joint winner with Leonid Kantorovich of the 1975 Nobel Memorial Prize in Economic Sciences."@en . . "1985-02-26Z"^^ . . . . . . . . . . . . "Dutch American economist" . . "Tjalling C. Koopmans"@en . "1910-08-28Z"^^ . "1910Z"^^ . .