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Richards F. M., Kundrot C. E. (1988). "Identification of structural motifs from protein coordinate data: secondary structure and first-level supersecondary structure". Proteins3 (2): 71–84. PMID3399495. doi:10.1002/prot.340030202.
Frishman D., Argos P. (1995). "Knowledge-based protein secondary structure assignment". Proteins23 (4): 566–579. PMID8749853. doi:10.1002/prot.340230412.