APA:
Zhu, Xuding (2011). Graphs with chromatic numbers strictly less than their colouring numbers.
Ars mathematica contemporanea, volume 4, issue 1, str. 25-27.
URN:NBN:SI:DOC-90GM3ZY1 from http://www.dlib.si
MLA:
Zhu, Xuding. "Graphs with chromatic numbers strictly less than their colouring numbers."
Ars mathematica contemporanea volume 4. issue 1 (2011) str. 25-27.
<http://www.dlib.si/?URN=URN:NBN:SI:DOC-90GM3ZY1>