TY  - JOUR
AU  - Piper, Greg
TI  - Regular closure and corresponding ${\Cal P}_K \lambda$ versions of $\diamondsuit$ and $\clubsuit$
JO  - Acta Universitatis Carolinae. Mathematica et Physica
PY  - 2005
SP  - 67
EP  - 76
VL  - 46
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AUCMP_2005__46_2_a11/
LA  - en
ID  - AUCMP_2005__46_2_a11
ER  -