TY - JOUR AU - Alejandro A. Schäffer AU - Ashok Subramanian TI - A note on the chromatic number of the alternative negation of two graphs JO - Colloquium Mathematicum PY - 1987 SP - 367 EP - 370 VL - 55 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-55-2-367-370/ DO - 10.4064/cm-55-2-367-370 LA - en ID - 10_4064_cm_55_2_367_370 ER -