@article{MET_1972__19_175543,
     author = {R.P. Gupta},
     title = {Principal {Components} {Analysis} in the {Complex} {Case.}},
     journal = {Metrika},
     pages = {150--155},
     publisher = {mathdoc},
     volume = {19},
     year = {1972},
     zbl = {0256.62051},
     url = {http://geodesic.mathdoc.fr/item/MET_1972__19_175543/}
}