“Arnold Sommerfeld generalized Bohr's model to include elliptical orbits in three dimensions. He treated the problem relativistically (using Einstein's formula for the increase of mass with velocity), ... According to historian Max Jammer, this success of Sommerfeld's fine-structure formula "served also as an indirect confirmation of Einstein's relativistic formula for the velocity dependence of inertia mass.” PhysicsHistory Of ScienceFine Structure Constant Book:Making 20th Century Science: How Theories Became Knowledge Source: Making 20th Century Science: How Theories Became Knowledge