@article {MosqueraPerez97b, title = {An Algorithm for Interpolation with Positive Rational Functions on the Imaginary Axis}, journal = {Automatica}, volume = {33}, year = {1997}, pages = {2277-2280}, keywords = {interpolation, SPR}, author = {C. Mosquera and Fernando P{\'e}rez-Gonz{\'a}lez} }