@article{GDZPPN002413094, title = {Zonal Approximation Processes.}, journal = {Mathematische Zeitschrift}, volume = {135}, year = {1973}, pages = {81-92}, zbl = {0252.41022}, url = {http://dml.mathdoc.fr/item/GDZPPN002413094} }
Schempp, Walter; Dreseler, Bernd. Zonal Approximation Processes.. Mathematische Zeitschrift, Tome 135 (1973) pp. 81-92. http://gdmltest.u-ga.fr/item/GDZPPN002413094/