Franz Peherstorfer, Petro Yudytskiy,
"Uniform approximation of ${\rm sgn}(x)$sgn(x) by rational functions with prescribed poles"
, in Zh. Mat. Fiz. Anal. Geom., Vol. 3, Nummer 1, 2007
Original Titel:
Uniform approximation of ${\rm sgn}(x)$sgn(x) by rational functions with prescribed poles
Forschungs-