Finding commentary in books
Some Subject search terms to use in SOLO
Specific
Art treasures in war
General works (which may well include eg chapter on this aspect)
Cultural property -- Protection (International law)
Perhaps also try
Art thefts
Archaeological thefts
The Routledge Handbook of Heritage Destruction by 
War and Cultural Heritage: an analysis of the 1954 Convention for the Protection of Cultural Property in the event of armed conflict and its Two Protocols by 
The Protection of Cultural Property in Armed Conflict by In 2017, Westminster passed the necessary legislation to enable the United Kingdom to implement the Hague Convention for the Protection of Cultural Property in the Event of Armed Conflict of 1954 and the Protocols to that Convention of 1954 and 1999.
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