TRANSFORMATIONS OF TETRAHYDRO-PYRIDO[4,3-D]PYRIMIDINES [B]-CONDENSED WITH ISOXAZOLE, THIAZOLE, THIADIAZOLE, AND TRIAZOLE UNITS UNDER THE ACTION OF ACTIVATED ALKYNES Article Voskressensky L.G., Borisova T.N., Ovcharov M.V., Kulikova L.N., Sorokina E.A., Borisov R.S., Varlamov A.V. Chemistry of Heterocyclic Compounds. Латвийский институт органического синтеза Латвийской академии наук / Springer New York Consultants Bureau. Vol. 44. 2008. P. 1510-1519