@article{GDZPPN002224992, title = {Uniqueness in the first maximum problem.}, journal = {Manuscripta mathematica}, volume = {43}, year = {1983}, pages = {101-104}, zbl = {0516.47004}, url = {http://dml.mathdoc.fr/item/GDZPPN002224992} }
Ptak, Vlastimil. Uniqueness in the first maximum problem.. Manuscripta mathematica, Tome 43 (1983) pp. 101-104. http://gdmltest.u-ga.fr/item/GDZPPN002224992/