1. HYDROGEN: geometry;Stoicheff;Can. J. Phys.,1957
2. HYDROGEN: energies;Fraga;J. Chem. Phys.,1961
3. TRIPLET METHYLENE: geometry;Herzberg,1967
4. TRIPLET METHYLENE: energies;Krauss;J. Res. Natn. Bur. Stand.,1964
5. SINGLET METHYLENE: geometry;Herzberg,1967