16th century microtonal Portuguese manuscript

This may be another early microtonal composition. I came across it looking for Fokker's paper on expanded harmony.

Microtones in a Sixteenth Century Portuguese Manuscript
Author(s): Hoyle Carpenter
Reviewed work(s):
Source: Acta Musicologica, Vol. 32, Fasc. 1 (Jan. - Mar., 1960), pp. 23-28
Published by: International Musicological Society
Stable URL: http://www.jstor.org/stable/931819 .

--John