Summary
Ole Christensen and Khadija L. Christensen (2005) Approximation theory. Birkhauser Boston, Inc., Boston, MA 
Bibtex entry
@BOOK { MR2224952,
AUTHOR = { Ole Christensen and Khadija L. Christensen },
TITLE = { Approximation theory },
SERIES = { Applied and Numerical Harmonic Analysis },
NOTE = { From Taylor polynomials to wavelets, Corrected second printing of the 2004 original },
PUBLISHER = { Birkhauser Boston, Inc., Boston, MA },
YEAR = { 2005 },
PAGES = { xii+156 },
ISBN = { 0-8176-3600-5 },
MRCLASS = { 41-01 (42-01) },
MRNUMBER = { 2224952 (2006m:41001) },
DOI = { 10.1007/978-0-8176-4448-2 },
URL = { http://dx.doi.org/10.1007/978-0-8176-4448-2 },
}