@Article{zbMATH03050016,
Author = {J. A. {Clarkson}},
Title = {{A property of derivatives}},
FJournal = {{Bulletin of the American Mathematical Society}},
Journal = {{Bull. Am. Math. Soc.}},
ISSN = {0002-9904; 1936-881X/e},
Volume = {53},
Pages = {124--125},
Year = {1947},
Publisher = {American Mathematical Society (AMS), Providence, RI},
Language = {English},
Zbl = {0032.27102}
}