1.
History of Approximation Theory From Euler to Bernstein
by Steffens, Karl-Georg, Anast...
ISBN: 9780817643539
List Price: $79.95
2.
�ber Alternationskriterien in der Geschichte der Besten Chebyshev-Approximation
by Steffens, Karl-Georg
ISBN: 9783640860296
List Price: $67.90