Nicholson, L. K.; Cross, T. A. (1989). “Gramicidin cation channel: an experimental determination of the right-handed helix sense and verification of.beta.-type hydrogen bonding”. Biochemistry (bằng tiếng Anh). 28 (24): 9379–9385. doi:10.1021/bi00450a019. PMID2482072.
Nicholson, L. K.; Cross, T. A. (1989). “Gramicidin cation channel: an experimental determination of the right-handed helix sense and verification of.beta.-type hydrogen bonding”. Biochemistry (bằng tiếng Anh). 28 (24): 9379–9385. doi:10.1021/bi00450a019. PMID2482072.