... and his footprints 

the famous Nitsche trick was first published in



a (nearly, w/o early 1950th papers) complete reference list is given in:


 A "quasi-optimal" shift theorem for linear parabolic equations with appropriately defined norms in a Hilbert scale framework  is proven in


Stefan (non-linear parabolic) problem related papers are:



Some additional  papers:




The several lecture notes were planned to be published in a book. Its content was nearly finished up to the below status, still available to be published:





Joachim A. Nitsche (1926-1996)