N. Rajana, P. Madhavan, H. R. Mohan, J. M. Babu, and K. Basavaiah, “An Orthogonal Approach for Method development, Validation and Trace Level Quantification of 2,5-Diamino-4,6-dichloro Pyrimidine Impurity in Abacavir Sulfate by LC-MS/MS and GC-MS”, ajc, vol. 29, no. 8, pp. 1853–1858, Jun. 2017.