@article{PismaZhETF.20.326,
    title = {Experimental observation of diffraction focusing of x rays},
    author = {Suvorov, E. V. and Polovinkina, V. I.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {20},
    issue = {5},
    pages = {326},
    year = {1974},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_27264.shtml},
}