Fülöp Ferenc; Wamhoff Heinrich; Sohár Pál: Imidazo[1’,2’:3,4]pyrimido[6,1-a]isoquinoline and Pyrimido[1’,2’:3,4]pyrimido[6,1-a]isoquinoline Ring Systems by Tandem Cyclization.
SYNTHESIS-STUTTGART, 27 (7). pp. 863-867. ISSN 0039-7881 (1995)