https://www.osti.gov/pages/biblio/1418708-bound-acoustic-modes-radiation-continuum-isotropic-layered-systems-without-periodic-structures
The U.S. Department of Energy's Office of Scientific and Technical Information
in theboundacousticmodesradiation
https://arxiv.org/abs/1309.1044
Abstract page for arXiv paper 1309.1044: Highly effective and isotropic pinning in epitaxial Fe(Se,Te) thin films grown on CaF2 substrates
highlyeffectiveisotropicpinningepitaxial