1.
, . Irregular singularities in several variables. Providence, R.I.: American Mathematical Society; 1982.
et . Irregular singularities in several variables. Providence, R.I. : American Mathematical Society, 3 juin 1982. ISBN 0-8218-2270-5
Essen Arno van den & Levelt Antonius Henricus Maria. (1982). Irregular singularities in several variables. American Mathematical Society.
MLA (8th ed.) CitationEssen Arno van den and Levelt Antonius Henricus Maria. Irregular Singularities in Several Variables. American Mathematical Society, 1982.
Warning: These citations may not always be 100% accurate.