We have recently proposed the s+g-wave model for superconducting borocarbides. In spite of a substantial s-wave component, this order parameter exhibits the \sqrt {H} dependent specific heat and a thermal conductivity linear in H in the vortex state. This is characteristic for nodal superconductors when T,{\Gamma } \ll {\Delta } where {\Gamma } is the quasiparticle scattering rate and {\Delta } the maximum superconducting gap. Here we investigate the thermal conductivity parallel to the c- and a-axis in a magnetic field tilted by \theta from the c-axis and rotating within the a--b plane.

PACS numbers: 74.60.Ec, 74.25.Fy, 74.70.Dd