1. O-Methylisourea;Encyclopedia of Reagents for Organic Synthesis;2006-09-15
2. O-Methylisourea;Encyclopedia of Reagents for Organic Synthesis;2001-04-15
3. S-Methylisothiourea;Encyclopedia of Reagents for Organic Synthesis;2001-04-15
4. Guanidine;Encyclopedia of Reagents for Organic Synthesis;2001-04-15