Trnje was amalgamated into the city in 1927 by MayorVjekoslav Heinzel, along with several other new districts, mainly for the purpose of housing people needed for Zagreb's industrial sector expansion.[2]
^Miroslav Šašić (2000-08-22). "Vjekoslav Heinzel, gradonačelnik koji je Zagreb učinio - »bijelim gradom«"(PDF). Vjesnik (in Croatian). p. 9. Archived from the original(PDF) on August 19, 2002. Retrieved 2011-01-11. Heinzel je dao na parcelaciju staro Sajmište, Borongaj i Kanal. [...] Izgrađeni su čitavi novi predjeli današnjega Zagreba, poput [...] Sigečice, Volovčice, Martinovke, Kruga, [...]