@article{PismaZhETF.109.705,
    title = {Comment to the CPT-symmetic Universe: Two possible extensions},
    author = {Volovik, G. E.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {109},
    issue = {10},
    pages = {705},
    year = {2019},
    doi = {10.7868/S0370274X1910014X},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X1910014X},
}