@article{700656,
     title = {Two-norm algebras},
     booktitle = {General topology and its relations to modern analysis and algebra IV},
     series = {GDML\_Books},
     publisher = {Society of Czechoslovak Mathematicians and Physicist},
     address = {Praha},
     year = {1977},
     pages = {[21]-24},
     mrnumber = {MR0504150},
     zbl = {0376.46029},
     url = {http://dml.mathdoc.fr/item/700656}
}

Alexiewicz, A. Two-norm algebras, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), pp. [21]-24. http://gdmltest.u-ga.fr/item/700656/