G. Suresh, R. Ratheesh, V. U. Nayar and M. Ichikawa  
Raman Spectroscopic Investigation on  the Phase Transitions in Rb3H(SeO4)2 and       
Rb3D(SeO4)2 Single Crystals Spectrochim.
Acta 52A (1996) 465-470.

T. Gohda, M. Ichikawa, T. Gustafsson and I. Olovsson
The Refinement of the Structure of the Ferroelectric Sodium Nitrite
J. Korean Phys. Soc. (Proc. Suppl.) 29 (1996) S551-S554.

T. Matsuo, K. Kohno and M. Ichikawa
Low Temperature Heat Capacity of K3H(SeO4)2 
J. Korean Phys. Soc. (Proc. Suppl.) 29 (1996) S432-S435.

T. Gohda, M. Ichikawa, T. Gustafsson and I. Olovsson
Deformation Electron Density Analysis of NaNO2 at 30 K
J. Korean Phys. Soc. (Suppl.) 32 (1998) S189- S191.

T. Gustafsson, M. Ichikawa and I. Olovsson
Studies on the Symmetry of Rb3H(SeO4)2 and Rb3D(SeO4)2  
J. Korean Phys. Soc. (Suppl.) 32 (1998) S199-S201.

K. Kohno, T. Matsuo and M. Ichikawa
Tunneling Effect in Phase Transitions of K3H(SeO4)2 and Its Deuterated Analogue
J. Korean Phys. Soc. (Suppl.) 32 (1998) S393-S396.

M. Uetani, O. Yamamuro, I. Inaba, T. Matsuo and M. Ichikawa
Quantum Effect in the Phase Transition of Cs3H(SeO4)2 Crystal: Calorimetric      
Study
J. Korean Phys. Soc. (Suppl.) 32 (1998) S397-S399.

M. Ichikawa, T. Gustafsson and I. Olovsson
Experimental Electron Density Study of NaH2PO4 at 30 K
Acta Cryst. B54 (1998) 29-34.

M. Ichikawa
Structure Isotope Effect on the in Hydrogen-Bonded Crystals ? Similarity and Difference 
between Deuteration and Pressure Effects
Polish J. Chem. 72 (1998) 230-240.