@inproceedings{ntogramatzidis_cantoni_2007, 
  title={On the sufficiency of finite-frame LQR optimality conditions for 2-D Roesser models}, 
  DOI={10.23919/ecc.2007.7068469}, 
  publisher={IEEE}, 
  author={Ntogramatzidis and Cantoni}, 
  year={2007}
  }