(4) Robert, A., Viallet, A., Rerolle, P., & Andreolecty, J. P. Improvements to the oxygen caustic soda method of bleaching cellulose pulp. Paper presented at 19th Congress of A.T.I.P., Strasbourg, 13th-18th June, 1966. A.T.I.P. Bulletin Vol. 20, No. 5 pp. 207-217 Abstructed in Pulp & Paper International Aug. 1966, p-47 Translated & Published in Paper Trade Journal, Aug. 5, 1968 p. 49 & Aug. 19, 1968 p. 40
(5) Robert, A., Traynord, P., Martin-Borret, O. Delignification & Bleaching of Chemical & Semi-chemical Cellulose Pulps. Canadian Patent 743,847 (9 Sept., 1964) French Patent 1,387,853.