%0 Journal Article
%A Chen, Gongrui
%A Wang, Wenxiao
%T On the $r$-free values of the polynomial $x^2 + y^2 + z^2 +k$
%J Czechoslovak Mathematical Journal
%D 2023
%P 955-969
%V 73
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.2023.0394-22/
%R 10.21136/CMJ.2023.0394-22
%G en
%F 10_21136_CMJ_2023_0394_22