Khairullina, Elvira; Santos y Ganges, Luis: Tram, trolleybus and bus services in Eastern-European socialist urban planning: Case studies of Magdeburg, Ostrava and Oryol (1950s and 1960s). Journal of Transport, kesäkuu 2021, s. 23-24. doi:10.1177/0022526620931834. (englanniksi)
Khairullina, Elvira; Santos y Ganges, Luis: Tram, trolleybus and bus services in Eastern-European socialist urban planning: Case studies of Magdeburg, Ostrava and Oryol (1950s and 1960s). Journal of Transport, kesäkuu 2021, s. 25-27. doi:10.1177/0022526620931834. (englanniksi)