http://npic.orst.edu/factsheets/degen.html
https://onlinelibrary.wiley.com/doi/abs/10.1002/jsfa.3127
https://search.proquest.com/openview/0ef95b1f8a16d8bff97ad01761253dc5/1?pq-origsite=gscholar&cbl=28850
http://npic.orst.edu/factsheets/degen.html
https://onlinelibrary.wiley.com/doi/abs/10.1002/jsfa.3127
https://search.proquest.com/openview/0ef95b1f8a16d8bff97ad01761253dc5/1?pq-origsite=gscholar&cbl=28850