A (polyvinyl caprolactam-polyvinyl acetate–polyethylene glycol graft copolymer)-dispersed sustained-release tablet for imperialine to simultaneously prolong the drug release and improve the oral bioavailabilityLin, Qing; Fu, Yu; Li, Jia; Qu, Mengke; Deng, Li; Gong, Tao; Zhang, Zhirong · European Journal of Pharmaceutical Sciences · 2015