HELOWICZ A., Integral bridges with prefabricated prestressed beams - designer experience. Scientific and Technical Conference Prestressed and Post-tension Concrete Structures, Kraków 16–17 April 2015; (in Polish).
HELOWICZ A., Multi-span integral viaducts made of box girders - designer experience. Scientific Conference - Bydgoszcz - Krynica Zdrój 2017; (in Polish).
HELOWICZ A., Designing of small integral bridges and culverts - designer experience. Scientific Conference - Bydgoszcz-Krynica Zdrój 2019; (in Polish).
BD31/01: 2001. Volume 2, Section 2, Part 12. The design of buried concrete box and portal frame structures. Design Manual for Roads and Bridges. The Stationery Office, London.
BD37/01: 2001. Volume 1, Section 3, Part 14. Loads for Highway Bridges. Design Manual for Roads and Bridges. The Stationery Office, London. ISBN 0115523545.