Não informado. (1988). Service report: Power plants, maintenance, upgrading. Siemens AG.
Lua i Stíl Chicago (17ú heag.)Não informado. Service Report: Power Plants, Maintenance, Upgrading. Erlangen, Alemanha: Siemens AG, 1988.
Lua MLA (8ú heag.)Não informado. Service Report: Power Plants, Maintenance, Upgrading. Siemens AG, 1988.
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