1. Strickland, J.D.H., and Parson, T.R.: A Practical Handbook of Seawater Analysis, (Fisheries Research Board of Canada, Ottawa 1968)
2. Lavorel, J., and Etienne, A.-L.: ‘In vivo chlorophyll fluorescence’, Barber, J., Primary Processes of Photosynthesis, (Elsevier, Amsterdam 1977), p. 203–268