TY  - JOUR
AU  - Chen, Gongrui
AU  - Wang, Wenxiao
TI  - On the $r$-free values of the polynomial $x^2 + y^2 + z^2 +k$
JO  - Czechoslovak Mathematical Journal
PY  - 2023
SP  - 955
EP  - 969
VL  - 73
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.2023.0394-22/
DO  - 10.21136/CMJ.2023.0394-22
LA  - en
ID  - 10_21136_CMJ_2023_0394_22
ER  -