@article{PismaZhETF.50.182,
    title = {Observation of surface superstructure on $Bi_2Sr_2CaCu_2O_x$ single crystal},
    author = {Al'tfeder, I. B. and Volodin, A. P. and Grazhulis, V. A. and Ionov, A. M. and Karabashev, S. G.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {50},
    issue = {4},
    pages = {182},
    year = {1989},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17080.shtml},
}