Sarges R, Bernhard W (1964). "gramicidin A. IV. Primary sequence of valine and isoleucine gramicidin A". Journal of the American Chemical Society. 86 (9): 1862–1863. doi:10.1021/ja01063a049. ISSN0002-7863.
Sarges R, Bernhard W (1964). "gramicidin A. IV. Primary sequence of valine and isoleucine gramicidin A". Journal of the American Chemical Society. 86 (9): 1862–1863. doi:10.1021/ja01063a049. ISSN0002-7863.