@article{RSMUP_1970__44__399_0,
     author = {Streb, Walter},
     title = {\"Uber schwach hyperzentrale {Ringe}},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {399--409},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {44},
     year = {1970},
     mrnumber = {299637},
     zbl = {0238.16025},
     language = {de},
     url = {http://www.numdam.org/item/RSMUP_1970__44__399_0/}
}