@article{GDZPPN002227967,
title = {\"Uber die Existenz gemeinsamer Elemente bester Approximation bez\"uglich zweier Normen.},
journal = {Manuscripta mathematica},
volume = {58},
year = {1987},
pages = {245-252},
zbl = {0643.41017},
url = {http://dml.mathdoc.fr/item/GDZPPN002227967}
}
Hadjisavvas, N.; Nassopoulos, B. Über die Existenz gemeinsamer Elemente bester Approximation bezüglich zweier Normen.. Manuscripta mathematica, Tome 58 (1987) pp. 245-252. http://gdmltest.u-ga.fr/item/GDZPPN002227967/