- N2O (NNO)
- Linear Triatomic Molecules: C2h (Cch)
- 16012C170...18014C180 (Molecules and Radicals , Vol 20)
- Linear Triatomic Molecules: BC1H+ (HBC1+) ... COSe (OCSe) (Landbolt-Bornstein: Numerical Data & Functional Relationships in Science & Technology - Group II)
- Linear Triatomic Molecules: COO+ (OCO+), CFeO (FeCO) ... CNO- (NCO-) (Numerical Data and Functional Relationships in Science and Technology)