+++2 J. Chem. Soc

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1) Usnic acid. Part I. Derivatives of methylphloroglucinol
Frank H. Curd and Alexander Robertson, J. Chem. Soc., 1933, p. 437

DOI:

http://dx.doi.org/10.1039/JR9330000437

2)Constituents of filix mas. Part II. The synthesis of filicinic acid
Alexander Robertson and (the late) William F. Sandrock, J. Chem. Soc., 1933, p. 1617

DOI:

http://dx.doi.org/10.1039/JR9330001617

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