OK, I found in:

"A METHOD TO ESTIMATE DENITRIFICATION POTENTIAL FOR REDENITRIFICATION SYSTEMS USING NUR BATCH TEST"

KATARZYNA KUJAWA* and BRAM KLAPWIJK

kD --- literature

2.9 Carrucci et al. (1996)

0.2±0.5 Henze (1991)

0.1±0.8 Kujawa et al. (1997)

0.2±0.5a STOWA (1992)

0.2±0.6 this study

:)