We discuss a recent necessary and sufficient condition for Melin's inequality for a class of systems of pseudodifferential operators.
@article{JEDP_2001____A1_0, author = {Brummelhuis, Raymond}, title = {Generalizations of Melin's inequality to systems}, journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, year = {2001}, pages = {1-8}, doi = {10.5802/jedp.585}, mrnumber = {1843402}, zbl = {01808677}, zbl = {1054.35153}, language = {en}, url = {http://dml.mathdoc.fr/item/JEDP_2001____A1_0} }
Brummelhuis, Raymond. Generalizations of Melin's inequality to systems. Journées équations aux dérivées partielles, (2001), pp. 1-8. doi : 10.5802/jedp.585. http://gdmltest.u-ga.fr/item/JEDP_2001____A1_0/
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