@article{PismaZhETF.49.630,
    title = {Direct determination of the phase of the reflection amplitude by means of standing x-ray waves},
    author = {Vartan'yants, I. A. and Koval'chuk, M. V. and Kon, V. G. and Nikolaenko, A. M. and Kharitonov, I. Yu.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {49},
    issue = {11},
    pages = {630},
    year = {1989},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17006.shtml},
}