@article{700683,
     title = {The notion of $\mathcal {K}$-shape},
     booktitle = {General topology and its relations to modern analysis and algebra IV},
     series = {GDML\_Books},
     publisher = {Society of Czechoslovak Mathematicians and Physicist},
     address = {Praha},
     year = {1977},
     pages = {95-98},
     mrnumber = {MR0461498},
     zbl = {0375.54028},
     url = {http://dml.mathdoc.fr/item/700683}
}

Doitchinov, D. The notion of $\mathcal {K}$-shape, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), pp. 95-98. http://gdmltest.u-ga.fr/item/700683/