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3 matching references were found.

Michielsen-Effinger, J., Ann. Soc. Sci. Bruxelles, Ser. 1, 1965, 79, 253. [all data]

Michielsen-Effinger, J., Bull. Cl. Sci., Acad. R. Belg., 1964, 50, 645. [all data]

Michielsen-Effinger, J., Bull. Cl. Sci., Acad. R. Belg., 1962, 48, 438. [all data]