Fogassy, E. et al. 1977. SEPARATION OF THE OPTICAL ISOMERS OF (± )-3-CARBOXY-4-OXO-6-METHYL-6,7,8,9-TETRAHYDRO-4H-PYRIDO(1,2-a)PYRIMIDINE AND DL-THREO-1-(p-NITROPHENYL)-2-AMINO-PROPANEDIOL-1,3 BY "MUTUAL-RESOLUTION". PART II Periodica Polytechnica Chemical Engineering. 21, 2 (Jan. 1977), 229–235.