G Warwick, Tech Take, EU funds Slovakian hydrogen VTOL, Aviation Week & Space Technology, 11-31 August 025, p63

In Slovakia, Tomark Proton is leading a project involving Airbus, BMW, Evolution Synergetique Automotive, HDF Energy, Neuman & Esser, plus Skeleton Technologies together with nine universities throughout Europe, including the design of composite recyclable high-pressure hydrogen tanks. A hydrogen-electric VTOL aircraft will also be developed.