Tatjana Timko, and Irena Ištoka Otković. “COMPARISON OF DIFFERENT HELIPORT SOLUTIONS FOR THE CLINICAL HOSPITAL CENTER IN OSIJEK”. Advances in Civil and Architectural Engineering, vol. 8, no. 14, Nov. 2021, pp. 58-67, https://hrcak.srce.hr/ojs/index.php/acae/article/view/19964.