Crack resistance of bismuth ferrite films obtained on a flexible substrate Shikhgasan Ramazanov, Ştefan Ţălu, Dinara Sobola, Farid Orudzev, Guseyn Ramazanov, Daud Selimov, Pavel Kaspar, Robert Macků and Anton Nazarov E3S Web Conf., 295 (2021) 04008 Published online: 26 July 2021 DOI: 10.1051/e3sconf/202129504008