Historical clue formulations

• ___ Hau, pioneering physicist from Denmark — 2018-04-26
• Singer Lovich — 2013-07-06
• Singer Lovich — 2012-06-08
• New Wave singer Lovich — 2007-08-25
• Unaspirated, in old phonetics — 1995-09-16
• Smooth, in phonetics — 1994-02-19