Béla Leffler
- Experience of duplex stainless steel in footbridges. Présenté pendant: Footbridge 2005 (Second International Congress), Venezia, 06-08 December 2005. (2005):
- (2008): Duplex Stainless Steel - a Material for Both the Functional Footbridge and the Spectacular Landmark. Présenté pendant: Footbridge 2008 - Footbridges for Urban Renewal, Third International Conference on Footbridges, 2-4 July 2008, Porto, Portugal.