4Borges NCC,Mendes GD,Barrientos-Astigarraga RE,et al.Verapamil quantification in human plasma by liquid chromatogra-phy coupled to tandem mass spectrometry.An applicaton for bio-equivalence study[J].J Chromatoggr B,2005,827:165-172.
5Gohel MC,Panchal MK.Novel use of similarity factors f2and Sdfor the development of diltiazem HCl modified-release tablets usinga 3(2)factorial design[J].Drug Dev Ind Pharm,2002,28(1):77-87.
6De Brabander C,Vervaet C,Remon JP.Development and evalu-ation of sustained relemini-matrices prepared via hot melt extrusion[J].J Controlled Release,2003,89(2):235-247.
