Try get the ref of Litchtenthaler, 1987, Chlorophylls and carotenoids:
Pigments of photosyntheticv biomembranes, Methods in Enzymology, Vol
148, pg 350-382.
There are however a few typographical errors in the manuscript in the
two tables inwhich the formulae are presented. Note that for total
chlorophyll a and b as well as for total pheaophytin a and b there
should be + not -. Check it out .... I have previously cleared there
typos with Helmut
Malcolme
--
Malcolme Logie
Internet: miml at hippo.ru.ac.za