@article{PismaZhETF.5.419,
    title = {Feasibility of Negative Differential Conductivity (NDC) Connected with Amplification of Sound in a Semiconductor in the Presence of Traps},
    author = {Gulyaev, Yu. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {5},
    issue = {11},
    pages = {419},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25219.shtml},
}