DETERMINING LOWER BOUND ON NUMBER OF VEHICLE BLOCKS IN MULTI-DEPOT VEHICLE SCHEDULING PROBLEM WITH MIXED FLEET COVERING ELECTRIC BUSES. - DUDA, Jerzy; FIEREK, Szymon; KARKULA, Marek; KISIELEWSKI, Piotr; PUKA, Radosław; REDMER, Adam; SKALNA, Iwona (Archives of Transport, 2023)