Here you can read more about Per-Olov Löwdin’s life.
Wikipedia article in Swedish:
And in English:
Scientific articles on Per-Olov Löwdin’s work:
Per-Olov Löwdin’s publication list:
Transcripts from an oral interview 1975 at Sanibel Island:
Official documents when Per-Olov Löwdin was installed in his office:
Royal decree of 13 May 1960 to promote Per-Olov Löwdin to a professorship in Quantum Chemsitry: