1. Bicyclic 5–5 Systems with One Bridgehead (Ring Junction) Nitrogen Atom: Three Extra Heteroatoms 2:1;Marco-Contelles,2008
2. Bicyclic 5–6 Systems with One Bridgehead (Ring Junction) Nitrogen Atom: Two Extra Heteroatoms 1:1;Regan,2008
3. Bicyclic 5–6 Systems with One Bridgehead (Ring Junction) Nitrogen Atom: Three Extra Heteroatoms 1:2;Hajos,2008
4. Bicyclic 5–5 Systems with One Ring Junction Nitrogen Atom: Three Extra Heteroatoms 2:1;Schantl,1996
5. Bicyclic 5–6 Systems with One Ring Junction Nitrogen Atom: Two Extra Heteroatoms 1:1;Sliskovic,1996