@articleMaeda_Takiguchi_Morita_Ishikawa_Hemsel_2010, title=Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics, volume=57, DOI=10.3938/jkps.57.924, number=4, journal=Journal of Korean Physical Society, author=Maeda, Takafumi and Takiguchi, Norihito and Morita, Takeshi and Ishikawa, Mutsuo and Hemsel, Tobias, year=2010, pages=924–928 

@articleMaeda_Takiguchi_Morita_Ishikawa_Hemsel_2010, title=(K,Na)NbO3 lead-free piezoelectric ceramics synthesized from hydrothermal powders, volume=64, DOI=10.1016/j.matlet.2009.10.012, number=2, journal=Materials Letters, author=Maeda, Takafumi and Takiguchi, Norihito and Morita, Takeshi and Ishikawa, Mutsuo and Hemsel, Tobias, year=2010, pages=125–128