Santen, Jan Heinrich van. |
On a generalization of the Lorentz-Lorentz formula / by J.H. van Santen and W. Opechowski |
[S.l. : s.n., 1948?] |
Opechowski, W. |
On the anisotropic exchange interaction and the behaviour of copper potassium sulphate at very low temperatures / by W. Opechowski |
[S.l. : s.n., 1948?] |