@article{kusano_swanson_usami_1985, 
  title={Pairs of positive solutions of quasilinear elliptic equations in exterior domains}, 
  volume={120}, 
  DOI={10.2140/pjm.1985.120.385}, 
  publisher={Mathematical Sciences Publishers}, 
  author={Kusano and Swanson and Usami}, 
  year={1985}, 
  month={Dec}
  }