5,5-system with a bridgehead nitrogen atom / P. Paolini
Indolizine and aza derivatives with additional nitrogens in the 5-membered ring / H.L. Blewitt
Azaindolizine systems having more than one nitrogen atom in the 6-membered ring / Georges Mauey
The chemistry of cyclazines / Alfred Taurins
Dithiole and dithiolium systems / R.D. Hamilton and E. Campaigns
Heteropentalenes / K.T. Potts
Borazaromatic compounds / Albert J. Fritsch
Syntheses and properties of cyanine and related dyes / David M. Sturmer.