@article{10_4064_sm8531_7_2016,
     author = {Fritz Gesztesy and Michael Pang},
     title = {On (conditional) positive semidefiniteness in a matrix-valued context},
     journal = {Studia Mathematica},
     pages = {143--192},
     year = {2017},
     volume = {236},
     number = {2},
     doi = {10.4064/sm8531-7-2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm8531-7-2016/}
}