RIDVAN, L., BUDĚŠÍNSKÝ, M., TICHÝ, M., MALOŇ, P., ZÁVADA, J., PODLAHA, J., CÍSAŘOVÁ, I. Axially chiral bis(ŕ-amino acid)s and dioxopiperazines. Synthesis and configurational assignment. Tetrahedron. 1999, 55(42), 12331-12348. ISSN 0040-4020. E-ISSN 1464-5416.