We review some important topics related to the semirelativistic description of bound states by the spinless Salpeter equation: the special case of the Coulomb interaction, numerical approximation methods, and a way to avoid the problematic square-root operator of the relativistic kinetic energy.

This issue of MLTJ seeks to involve expert authors in the knowledge of the extracellular matrix (ECM) of the tendons. This journal and scientific societies behind us: European Federation of Sport Traumatology (EFOST) and Italian Society of Muscles Ligaments and Tendons (I.S.Mu.L.T.) are heavily involved in supporting and promoting the study of ECM tendons1-3. We believe that only through the cl...