APCOM APCOM 2021 : 26th International conference on applied physics of condensed matter. Štrbské Pleso, Slovak Republic. June 23-25, 2021 / ed. Jozef Sitek,Ján Vajda, Igor Jamnický. -- 1. ed. -- Melville : AIP Publishing, 2021. -- 351 s. online. -- (AIP Conference Proceedings, ; Vol. 2411 ISSN ISSN 0094-243X). -- ISBN : 978-0-7354-4138-5. Sitek, Jozef, 1944-. Vajda, Ján, 1950-. Jamnický, Igor