References
- Stojanov , N. and Savchev , P. 1964 . Investigation on natural deposits and natural stocks of Leucojum aestivum in Bulgaria . Farmacia , 14 (5) : 54 – 60 .
- Stojanov , E. A. 1964 . Galanthaminum hydrobromicum “Nivalin”;, a new antidot for undepolarisation of muscle relaxing . Anaesthesist , 13 (7) : 217 – 220 .
- Stefanov , J. , Savchev , P. and Mitkov , I. 1974 . Qualitative and quantitative investigations on the alkaloid composition of wild and introduced populations of Leucojum aestivum . Farmacia , 24 (6) : 16 – 19 .
- Bremner , J. M. and Keeney , D. R. 1966 . Detrmination and isotope ratio analysis of different forms of nitrogen in soils: 3. Exchangeable amonium nitrate and nitrate by extraction‐distillation methods . Soil Sci. Soc. Amer. Proc. , 30 : 577 – 582 .
- Tencheva , J. , Yamboliev , I. and Zhivkova , Z. 1987 . Reversed phase liquid chromatography for the determination of galanthamine and its metabolites in human plasma and urine . J. Chromatogr. , 421 : 396 – 400 .