Formally normal ordinary differential operators
Coddington, E. A.
Differential Equations and Their Applications, GDML_Books, (1967), p. 65-72 / Harvested from
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@article{700198,
     title = {Formally normal ordinary differential operators},
     booktitle = {Differential Equations and Their Applications},
     series = {GDML\_Books},
     publisher = {Slovensk\'e pedagogick\'e nakladate\v lstvo},
     address = {Bratislava},
     year = {1967},
     pages = {65-72},
     zbl = {0179.46903},
     url = {http://dml.mathdoc.fr/item/700198}
}

Coddington, E. A. Formally normal ordinary differential operators, dans Differential Equations and Their Applications, GDML_Books,  (1967), pp. 65-72. http://gdmltest.u-ga.fr/item/700198/