(Gatlinburg)International Conference on the Physics of Electronic and Atomic Collisions International Conference on the Physics of Electronic and Atomic Collisions (Konigstein)International Conference on the Physics of Selenium and Tellurium International Conference on the Physics of Selenium and Tellurium International conference on the physics of semiconductors International Conference on the Physics of Semiconductors. (Providence)International Conference on the Physics and Chemistry of Solid Surfaces 2d International conference on the strength of metals and alloys Pittsburgh International Conference on General Topology and its Applications 2d International conference on the strength of metals and alloys. 1