References to the use of Chorda filum as salad, before 1997. In the books:
•Chapman, V.J. and Chapman, D.J. Seaweeds and Their Uses. London: Chapman and Hall, 1980, p. 64
•Madlener. J.C. The Seavegetables book. New york: Clarkson N. Potter, Inc 1977, p. 69