Kostic? NSS, Dotsikas Y, Malenovic? ASS, Stojanovic? BJ, Rakic? T, Ivanovic? D, Medenica M. Stepwise optimization approach for improving LC-MS/MS analysis of zwitterionic antiepileptic drugs with implementation of experimental design. Journal of Mass Spectrometry [Internet]. 2013;48(7):875 - 884.