Ohta A, Danev R, Nagayama K, Mita T, Asakawa T, Miyagishi S. Transition from nanotubes to micelles with increasing concentration in dilute aqueous solution of potassium N-acyl phenylalaninate. Langmuir. 2006 Sep 26;22(20):8472–7. doi: 10.1021/la0611110. PMID: 16981765.