Machine generated contents note: ch. 1 Critical Sound Propagation in Magnets / Andrzej Pawlak -- ch. 2 Magnetism in Pure and Doped Manganese Clusters / D.G. Kanhere -- ch. 3 Resonant Ultrasound Spectroscopy Close to Its Applicability Limits / Ludek Heller -- ch. 4 Hybrid Integrated External Cavity Lasers Based on Silica Planar Waveguide Grating / Jeong Hwan Song -- ch. 5 Quantum Theory on a Galois Field: Motivation and First Results / Felix M. Lev -- ch. 6 Black Hole Entropy from Entanglement: A Review / Sourav Sur -- ch. 7 Interpolating Gauges, Parameter Differentiability, WT-Identities and the e-Term / Satish D. Joglekar -- ch. 8 Exploitation of a Simple Integrated Heater for Advanced QCM Sensors / Emiliano Zampetti