1. BARLETTA, G., And R. MARCHETTI. Quaderni. Ist. Ric. Acque,9, Roma (1971).
2. BULJAN, M. Acta Adriatica5, 233 (1953).
3. CRISETIG, G., P. CORTESI AND E. CARPENE. La Nuova Vet.,3, 144 (1973).
4. DOTY, M. S. Current status of carbon-14 method of assaying productivity of the ocean. Report to U. S. Atomic Energy Commission under contract At.-(04-3)-15.
5. FAGANELLI, A. Arch. Oceanogr. Limnol.,12, 191 (1961).