On the Nordhaus-Gaddum class problems. - Nirmala Achuthan; N. R. Achuthan; Lou Caccetta (Australas. J Comb., 1990)

On defective colourings of complementary graphs. - Nirmala Achuthan; N. R. Achuthan; Mudin Simanihuruk (Australas. J Comb., 1996)

On mixed ramsey numbers. - Nirmala Achuthan; N. R. Achuthan; Lou Caccetta (Discret. Math., 1996)

On minimal triangle-free graphs with prescribed 1-defective chromatic number. - Mudin Simanihuruk; Nirmala Achuthan; N. R. Achuthan (Australas. J Comb., 1997)

On defective colourings of triangle-free graphs. - Mudin Simanihuruk; Nirmala Achuthan; N. R. Achuthan (Australas. J Comb., 1997)

Mixed Ramsey numbers: total chromatic number versus stars. - Nirmala Achuthan; Guantao Chen (Australas. J Comb., 1998)

On the vertex arboricity of graphs with prescribed size. - Nirmala Achuthan; N. R. Achuthan; Lou Caccetta (Australas. J Comb., 1999)

On the number of cut edges in a regular graph. - Nirmala Achuthan; A. Ramachandra Rao (Australas. J Comb., 2003)

On the Nordhaus-Gaddum Problem for the k-Defective Chromatic Number of a Graph. - Nirmala Achuthan; N. R. Achuthan; Mudin Simanihuruk (Electron. Notes Discret. Math., 2003)

The Nordhaus-Gaddum problem for the k-defective chromatic number of a P4-free graph. - Nirmala Achuthan; N. R. Achuthan; Mudin Simanihuruk (Australas. J Comb., 2011)

On minimal triangle-free graphs with prescribed k-defective chromatic number. - Nirmala Achuthan; N. R. Achuthan; Mudin Simanihuruk (Discret. Math., 2011)