TY  - JOUR
A1  - Grotendorst, Johannes
T1  - Approximating functions by means of symbolic computation and a general extrapolation method
JF  - Computer Physics Communications. 59 (1990), H. 2
Y1  - 1990
SN  - 0010-4655
SP  - 289
EP  - 301
ER  - 
TY  - JOUR
A1  - Ziemons, Karl
A1  - Herzog, H.
A1  - Feinendegen, L. E.
T1  - Iterative image reconstruction with weighted pixel contribution to projection element
JF  - European Journal of Nuclear Medicine
Y1  - 1990
SN  - 1619-7089
N1  - Abstracts of the European Association of Nuclear Medicine Congress ; V52
VL  - 16
IS  - 7
SP  - 403
EP  - 403
ER  -