1. D. Nužnyj, J. Petzelt, V. Bovtun, S. Kamba, J. Hlinka
    Soft mode driven local ferroelectric transition in lead-based relaxors
    Applied Physics Letters 114 (2019) 182901(1)-182901(5).
  2. J. Petzelt, D. Nužnyj
    Soft polar phonon mode in SrTiO3 single crystals, ceramics and thin films
    Chapter 1 in Strontium Titanate: Synthesis, Properties and Uses, eds. A. Tkach and P. Vilarinho, in series Materials Science and Technologies, Nova Science Publishers, 2019, pp. 1-39.