Metabolic Characterization of Withania somnifera from Different Regions of India Using NMR Spectroscopy - Namdeo, Ajay G.; Sharma, Ajay; Yadav, Kavita N.; Gawande, Rupali; Mahadik, Kakasaheb R.; Lopez-Gresa, Maria Pilar; Kim, Hye Kyong; Choi, Young Hae; Verpoorte, Robert (Planta Medica, 2011)