@incollection{AST_1980__75-76__149_0,
     author = {Krener, Arthur J.},
     title = {Boundary value linear systems},
     booktitle = {Analyse des syst\`emes},
     series = {Ast\'erisque},
     pages = {149--165},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {75-76},
     year = {1980},
     mrnumber = {581712},
     zbl = {0458.93027},
     language = {en},
     url = {http://www.numdam.org/item/AST_1980__75-76__149_0/}
}