We establish here necessary and sufficient conditions for quasi-total graphs to have crossing numbers k ( k = 1, 2 or 3).
Keywords : Quasi-total; Crossing numbers.
© 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.
DOI: 10.3329/jsr.v2i2.3527 J. Sci. Res. 2 (2), 257-263 (2010)