Hristov , S. 2023. Early results with the Delta Xtend shoulder arthroplasty as primary treatment or proximal humerus reoperation. THE JOURNAL OF THE BULGARIAN ORTHOPAEDICS AND TRAUMA ASSOCIATION. 60, 01 (Jul. 2023), 15–26. DOI:https://doi.org/10.58542/jbota.v60i01.74.