@article{PismaZhETF.107.340,
    title = {Dirac lines in the parameter and  momentum spaces},
    author = {Volovik, G. E.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {107},
    issue = {5},
    pages = {340},
    year = {2018},
    doi = {10.7868/S0370274X18050120},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X18050120},
}