@article{PismaZhETF.52.713,
    title = {Cancellation of anomalies for four-dimensional heterotic strings in a Lagrangian approach},
    author = {Ketov, S. V. and Kuzenko, S. M. and Solov'ev, O. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {52},
    issue = {2},
    pages = {713},
    year = {1990},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17439.shtml},
}