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8Pyrido[2,3-d]pyrimidines 4. Synthesis and some transformations of oxo(hydroxy)pyrido[2,3-d]pyrimidines, Chemistry of Heterocyclic Compounds Derivatives of Condensed Pyridopyrimidines. 3. Synthesis of Condensed Imidazo[4,5-b]pyridine and also 4-Oxo- and 2,4-Dioxopyrido[2,3-d]pyrimidines, Chemistry of Heterocyclic Compounds Novel method for the synthesis of pyrido[2,3-d]pyrimidine-2,4-diones from 5,7-dimethylpyrimido[4,5-e]-1,2,4-triazine-6,8-dione, Chemistry of Heterocyclic Compounds Synthesis of pyrido[2,3-d]pyrimidine-2,4-diones from pyrimido-[4,5-e]-1,2,4-triazine-6,8-diones by reversed azadiene synthesis, Chemistry of Heterocyclic Compounds Beitr??ge zur Chemie der Enaminoketone, 4. Mitt.: 1,2,3,4-Tetrahydro-pyrido[2,3-d]pyrimidin-2,4-dione, Monatshefte f??r Chemie / Chemical Monthly A convenient route for the synthesis of some new bi- and triheterocondensed uracils, Chemistry of Heterocyclic Compounds