15 .
Effect of short-range interactions on the transverse dynamics of KH$_2$PO$_4$
16 ,
3223
)
16 .
Cluster dynamical theory for the low-lying ferroelectric modes in KDP-type crystals
)
17 .
Critical behaviour of electric field gradient in the Perovskite-type ferro-electric PbHFO$_3$
)