@article{PismaZhETF.90.408,
    title = {Unusually strong coherent response from grain-boundary Josephson network in polycrystalline Pr$_{\boldsymbol{x}}$Y$_{\boldsymbol{1-x}}$Ba$_{\bf2}$Cu$_{\bf3}$O$_{\boldsymbol{7-\delta}}$},
    author = {Rivera, V. A. G. and Sergeenkov, S. and Stari, C. and Cichetto, L. Jr. and Cardoso, C. A. and Marega, E. and Araujo-Moreira, F. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {90},
    issue = {5},
    pages = {408},
    year = {2009},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_28604.shtml},
}