@article{borodin_ivanova_2020, 
  title={Soft $3$-stars in sparse plane graphs}, 
  volume={17}, 
  DOI={10.33048/semi.2020.17.126}, 
  publisher={Sobolev Institute of Mathematics}, 
  author={Borodin, O. V. and Ivanova, A. O.}, 
  year={2020}, 
  month={Nov}
  }