@article{00247049, title = {Structural theorems for the }, journal = {Mathematica Pannonica}, volume = {4}, year = {1993}, pages = {23-35}, zbl = {0796.46021}, language = {en}, url = {http://dml.mathdoc.fr/item/00247049} }
Pilipović, S.; Stanković, B. Structural theorems for the . Mathematica Pannonica, Tome 4 (1993) pp. 23-35. http://gdmltest.u-ga.fr/item/00247049/