[en] The interaction of superconductivity and long-range magnetic order was examined in various ternary and pseudoternary rare earth rhodium boride compounds. Upper critical magnetic field Hc2 measurements obtained from resistance data demonstrate that LuRh4B4 is a type II superconductor with Hc2(0) = 60 kOe and a Ginzburg-Landau parameter k approx. = 23. These upper critical field results are compared with those which were obtained using ac magnetic susceptibility data