See also:

• Science: Chemistry: Elements: Lanthanides  (2)

• ChemGlobe: Lutetium - Electronic, thermal, and steric data along with an isotope table.
• ChemicalElements.com: Lutetium - Basic information, atomic structure, and table of isotopes.
• EnvironmentalChemistry.com: Lutetium - Atomic structure, chemical and physical properties, and table of nuclides.
• It's Elemental: Lutetium - Basic physical and historical information.
• LANL: Lutetium - Basic information and history.
• Lenntech: Lutetium - Physical data, chemical properties, health and environmental effects.
• Visual Elements: Lutetium - Image, physical information, and key isotopes.
• Wikipedia: Lutetium - Properties of the element, including its history, applications, and characteristics.