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2. Serological aspects of the vaccination against hog cholera with crystal violet vaccine;Bekkum;Tijdschr. Diergeneesk.,1966
3. Feltkamp , T. E. W. 1966 Idiopathic autoimmune diseases. A study of their serological relationship Thesis Univ. of Amsterdam
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5. Assay of rubella antibodies by immunofluorescence, complement fixation and neutralization;Gispen;Arch. ges. Virusforsch.,1967