@article{PismaZhETF.67.666,
    title = {Gravity of monopole and string and gravitational constant  in $^3$He-A},
    author = {Volovik, G. E.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {67},
    issue = {9},
    pages = {666},
    year = {1998},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_15313.shtml},
}