@article{RCM_1982__16_181715,
     author = {T.V. Panchapagesan},
     title = {A {Note} {On} {Spectral} {And} {Prespectral} {Operators.}},
     journal = {Revista colombiana de matematicas},
     pages = {57--64},
     publisher = {mathdoc},
     volume = {16},
     year = {1982},
     zbl = {0492.47020},
     url = {http://geodesic.mathdoc.fr/item/RCM_1982__16_181715/}
}