@article{01354879, title = {A separation theorem for }, journal = {Mathematica Pannonica}, volume = {9}, year = {1998}, pages = {103-109}, zbl = {0929.26008}, language = {en}, url = {http://dml.mathdoc.fr/item/01354879} }
Matkowski, Janusz; Zgraja, Tomasz. A separation theorem for . Mathematica Pannonica, Tome 9 (1998) pp. 103-109. http://gdmltest.u-ga.fr/item/01354879/