@article{PismaZhETF.47.494,
    title = {Nonlinear high-resolution subsurface imaging: new application of self-focusing},
    author = {Askar'yan, G. A. and Yurkin, A. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {47},
    issue = {10},
    pages = {494},
    year = {1988},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_16572.shtml},
}