The source article https://pubs.aip.org/aapt/ajp/article/91/10/819/2911822/All-objects-and-some-questions https://pubs.aip.org/aapt/ajp/article/91/10/819/291182

The source article https://pubs.aip.org/aapt/ajp/article/91/10/819/2911822/All-objects-and-some-questions https://pubs.aip.org/aapt/ajp/article/91/10/819/2911822/All-...