Experimental and theoretical structure characterization of two isoniazid derivatives: 2,4-Difluoro-N'-isonicotinoylbenzohydrazide and 2,4-dichloro-N'-isonicotinoylbenzohydrazide hydrochloride - Silva Júnior, Floriano P.; Ellena, Javier; Ferreira, Marcelle de Lima; Mascarenhas, Yvonne Primerano; Souza, Marcus V. N. de; Vasconcelos, Thatyana R. A.; Wardell, James Lewis; Wardell, Solange M. S. V. (Journal of Molecular Structure, 2006)