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- High-risk pregnancy : a team approach / edit. Robert A. Knuppel, Joan E. Drukker . - 2nd ed. - Philadelphia : Saunders , 1993 - xii, 769 s. ISBN 0-7216-3455-9 [1, currently available 1]
- Chapters, articles
- High-risk pregnancy : a team approach / Robert A. Knuppel, Joan E. Drukker - Philadelphia : Saunders , 1986 - xv, 604 s. ISBN 0-7216-5503-3 [1, currently available 1]
- Chapters, articles