References
- Cooper , S. F. , Massé , R. and Dugal , R. 1989 . J. Chromatogr. , 489 : 65
- 1980 . The United States Pharmacopoeia, , XXth Rev. , 334 – 335 . Rockville : United States Pharmacopeial Convention .
- Perez , J. B. , Danhier , A. C. and Brieva , J. A. 1967 . Acad. Farm. , 33 : 233
- Vachek , J. 1961 . Cesk. Farmazie , 10 : 515
- Magalhoes , J. F. and Piros , G. M. 1970 . Rev. Farm. Bioquim. [Univ. Sao Paulo] , 8 : 273
- Mohamed Abel-Maboud , I. 1989 . J. Assoc. Off. Anal. Chem. , 72 : 885
- Issopoulos , P. B. 1989 . Fresenis' Z. Anal. Chem. , 334 : 554
- Zivanovic , L. , Agatonovic , S. and Radulovic , D. 1990 . Mikrochim. Acta , I : 49
- Sastry , Ch. S. P. , Prasad , T. N. V. , Sastry , B. S. and Rao , E. V. 1988 . Analyst , 113 : 255
- Folin , O. 1922 . J. Biol. Chem. , 51 : 377
- Rosenblatt , D. H. , Hlinka , P. and Epstein , J. 1955 . Anal. Chem. , 27 : 1290
- Gürkan , T. 1976 . Mikrochimica Acta , I : 165 [12]
- Hashimoto , Y. , Endo , M. , Keido , T. , Shigeko , I and Masataka , M. 1978 . Mickrochimica Acta , II : 493
- Campíns Falcó , P. , Sevillano Cabeza , A. and Molins Legua , C. 1994 . Anal. Lett. , 27 : 531
- Molins Legua , C. , Campíns Falcó , P. and Sevillano Cabeza , A. 1993 . Anal. Chim. Acta , 283 : 635
- Molins Legua , C. , Campíns Falcó , P. and Sevillano Cabeza , A. 1994 . Fresenius' J. Anal. Chem. , 349 : 311
- Cardone , M. J. 1987 . Anal. Chem. , 59 : 2818
- Youden , W. P. 1947 . Anal. Chem. , 19 : 946
- Campíns Falcó , P. , Bosch Reig , F. and Verdú Andrés , J. 1992 . Anal. Chim. Acta , 270 : 253
- Bosch Reig , F. , Verdú Andrés , J. , Campíns Falcó , P. and Molins Legua , C. 1994 . Talanta , 41 : 39
- 1980 . ACS Committee of Environmental Improvement . Anal. Chem. , 52 : 2242