000
00244nam a2200097 a 4500
082
_a
621.38
_b
OPE
245
_a
Electronics and electrical engineering
260
_a
Nawala ;
_b
Open University of Srilanka,
_c
1986.
300
_a
73 p. :
942
_c
REF
999
_c
36825
_d
36825