Franz Peherstorfer, Petro Yudytskiy,
"Uniform approximation of ${\rm sgn}(x)$sgn(x) by rational functions with prescribed poles"
, in Zhurnal Matematicheskoi Fiziki, Analiza, Geometrii, Vol. 3, Nummer 1, 2007, ISSN: 1812-9471
Original Titel:
Uniform approximation of ${\rm sgn}(x)$sgn(x) by rational functions with prescribed poles
Forschungs-