Vorwort.
Kongruenz Heft 1, GDML_Books, (1889), p. III / Harvested from
Access to full text 
@article{PPN622650963+DMDLOG_0002,
     title = {Vorwort.},
     booktitle = {Kongruenz Heft 1},
     series = {GDML\_Books},
     publisher = {Nebert},
     address = {Halle},
     year = {1889},
     pages = {III},
     url = {http://dml.mathdoc.fr/item/PPN622650963+DMDLOG_0002}
}

 (éd.). Vorwort., dans Kongruenz Heft 1, GDML_Books,  (1889), p. III. http://gdmltest.u-ga.fr/item/PPN622650963+DMDLOG_0002/