Geodesic
On the bicompact Ponomarev--Zaitsev extension and the so-called spectral parasite
Sbornik. Mathematics, Tome 17 (1972) no. 2, pp. 317-326

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An intrinsic characterization of a Ponomarev–Zaitsev space $\omega_\varkappa X$ among other semiregular bicompact extensions (of a given $T_\lambda$-space $X$) is given in the paper. An example is constructed of a semiregular Hausdorff space $\Omega$ which is countable and has a countable base and whose spectrum over the family of all of its partitions is a spectral parasite. Bibliography: 7 titles. 
@article{SM_1972_17_2_a10,
     author = {E. V. Shchepin},
     title = {On the bicompact {Ponomarev--Zaitsev} extension and the so-called spectral parasite},
     journal = {Sbornik. Mathematics},
     pages = {317--326},
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     volume = {17},
     number = {2},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_17_2_a10/}
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E. V. Shchepin. On the bicompact Ponomarev--Zaitsev extension and the so-called spectral parasite. Sbornik. Mathematics, Tome 17 (1972) no. 2, pp. 317-326. http://geodesic.mathdoc.fr/item/SM_1972_17_2_a10/