@article{ETNA_2016__45__a23,
     author = {Grubi\v{s}i\'c,  Luka and Miodragovi\'c,  Suzana and Truhar,  Ninoslav},
     title = {Double angle theorems for definite matrix pairs},
     journal = {Electronic transactions on numerical analysis},
     pages = {33--57},
     year = {2016},
     volume = {45},
     zbl = {1338.15018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2016__45__a23/}
}