TY  - UNPB
N1  - Unpublished
A1  - Samsul Maarif, SMF
TI  - Peer Reviu_Is exemplification the one and only way to describe that empty set is subset 
of any sets?
ID  - repository11992
AV  - public
UR  - http://repository.uhamka.ac.id/id/eprint/11992/
PB  - UHAMKA
ER  -