@article{Blank_1989,
    doi = {10.1070/rm1989v044n06abeh002302},
    url = {https://doi.org/10.1070%2Frm1989v044n06abeh002302},
    year = {1989},
    month = {dec},
    publisher = {Steklov Mathematical Institute},
    volume = {44},
    number = {6},
    pages = {1--33},
    author = {M L Blank},
    title = {Small perturbations of chaotic dynamical systems},
    journal = {Russian Mathematical Surveys}
}

@article{Blank_1989, doi = {10.1070/rm1989v044n06abeh002302}, url = {https://doi.org/10.1070%2Frm1989v044n06abeh002302}, year = {1989}, month = {dec}, publisher = {Steklov Mathematical Institute}, volume = {44}, number = {6}, pages = {1--33}, author = {M L Blank}, title = {Small perturbations of chaotic dynamical systems}, journal = {Russian Mathematical Surveys} }