Luxembourg's Prince Frederik dies of uncommon illness – DW (English)
- Luxembourg’s Prince Frederik dies of uncommon illness DW (English)
- Prince Frederik of Luxembourg dies from uncommon illness CNN
- Prince Frederik, son of Prince Robert of Luxembourg, dies of uncommon POLG illness at 22 USA TODAY
- Prince Frederik of Luxembourg has died at age 22, royal household proclaims Hindustan Occasions
- Luxembourg’s Prince Frederik Dies at 22 from Uncommon Genetic Situation: ‘He Is My Superhero,’ Says Dad Prince Robert PEOPLE