@article{paperid:1040025,
author = {Khashyarmanesh, Kazem and Khorsandi, Mahdi Reza},
title = {Projective total graphs of commutative rings},
journal = {Rocky Mountain Journal of Mathematics},
year = {2013},
volume = {43},
number = {4},
month = {December},
issn = {0035-7596},
pages = {1207--1213},
			numpages = {6},
keywords = {Total graph; projective graph; crosscap number; zero-divisor graph.},
}