Novel Approaches to Fused Phospha-Pyrimidines - Volochnyuk, Dmitriy M; Kovaleva, Svetlana A; Chernega, Alexandr N; Chubaruk, Nataliya G; Kostyuk, Alexandr N; Pinchuk, Alexandr M; Tolmachev, Andrey A; Schmutzler, Reinhard (Synthesis, 2006)