Geodesic
Sum theorems for the tightness and $\pi$-character in the class of compact spaces
Commentationes Mathematicae Universitatis Carolinae, Tome 24 (1983) no. 1, pp. 51-62 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Classification : 54A25, 54B25, 54B35, 54D30 
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Tkačenko, Michael G. Sum theorems for the tightness and $\pi$-character in the class of compact spaces. Commentationes Mathematicae Universitatis Carolinae, Tome 24 (1983) no. 1, pp. 51-62. http://geodesic.mathdoc.fr/item/CMUC_1983_24_1_a4/

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[7] SHAPIROVSKII B. E.: On $\pi $-character and $\pi $ -weight in compact Hausdorff spaces. Dokl. Akad. Nauk SSSR 223 (1975), 799-802 (Soviet Math. Dokl. 16 (1975), 999-1004).