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"Riga Municipality Portal". Copyright 2003–2009, www.riga.lv/LV/Channels/ Riga Municipality. Archived from the original on 28 August 2011. Retrieved 27 July 2009.
Krastins, Janis (2006). "Architecture and Urban Development of Art Nouveau – Metropolis Riga". International Review of Sociology. 16 (2). Routledge: 395–425. doi:10.1080/03906700600709327. S2CID146754212.
"Riga Municipality Portal". Copyright 2003–2009, www.riga.lv/LV/Channels/ Riga Municipality. Archived from the original on 28 August 2011. Retrieved 27 July 2009.