@article{GDZPPN002533073,
title = {The subsets P+ and P- of the split interval.},
journal = {Publications de l'Institut Math\'ematique [Elektronische Ressource]},
volume = {20},
year = {1966},
pages = {121-124},
zbl = {0244.04002},
url = {http://dml.mathdoc.fr/item/GDZPPN002533073}
}
Skula, Ladislav. The subsets P+ and P- of the split interval.. Publications de l'Institut Mathématique [Elektronische Ressource], Tome 20 (1966) pp. 121-124. http://gdmltest.u-ga.fr/item/GDZPPN002533073/