@article{PismaZhETF.50.270,
    title = {Duality and $\beta$ functions in 2D Freedman-Townsend theory},
    author = {Ketov, S. V. and Osetrin, K. E. and Prager, Ya. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {50},
    issue = {6},
    pages = {270},
    year = {1989},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17106.shtml},
}