TY  - JOUR
AU  - Rao, K. P. R.
AU  - Kishore, G. V. N.
AU  - Sadik, Sk.
TI  - Unique common coupled fixed point theorem for four maps in $S_b$-metric spaces
JO  - Journal of Linear and Topological Algebra
VL  - 6
IS  - 1
SP  - 29
EP  - 43
PY  - 2017
DO  - 
ER  -