@article{700837,
     title = {Projection-spectra},
     booktitle = {General Topology and its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1967},
     pages = {25-30},
     zbl = {0164.53002},
     url = {http://dml.mathdoc.fr/item/700837}
}

Alexandroff, P.; Ponomarev, V. Projection-spectra, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1967), pp. 25-30. http://gdmltest.u-ga.fr/item/700837/