@article{PismaZhETF.101.931,
    title = {On the defect and stability of differential expansion},
    author = {Kononov, Ya. and Morozov, A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {101},
    issue = {12},
    pages = {931},
    year = {2015},
    doi = {10.7868/S0370274X15120115},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X15120115},
}