* Fetal Gastroschisis: A Comparison of Second vs. Third-Trimester Bowel Dilatation for Predicting Bowel Atresia and Neonatal Outcomes. Lato K, Poellmann M, Knippel AJ, Bizjak G, Stressig R, Hammer R, Janni W, Kozlowski P. Ultraschall Med. 2011 Dec 9. [Epub ahead of print]
* Impact of Maternal Obesity and Maternal Overweight on the Detection Rate of Fetal Heart Defects and the Image Quality of Prenatal Echocardiography. Uhden M, Knippel AJ, Stressig R, Hammer R, Siegmann H, Froehlich S, Kozlowski P. Ultraschall Med. 2011 Aug 29. [Epub ahead of print]
* Comparing first trimester screening performance: routine care gynaecologists' practices vs. prenatal centre. Kozlowski P, Knippel AJ, Stressig R. Ultraschall Med. 2007 Jun;28(3):291-5.
* Additional performance of nasal bone in first trimester screening. Kozlowski P, Knippel AJ, Froehlich S, Stressig R. Ultraschall Med. 2006 Aug;27(4):336-9.
* Quantitative fluorescent polymerase chain reaction versus cytogenetics: risk-related indication and clinical implication of nondetected chromosomal disorders. Kozlowski P, Grund I, Hickmann G, Stressig R, Knippel AJ. Fetal Diagn Ther. 2006;21(2):217-23.
* Aktuelle Entwicklungen im vorgeburtlichen Screening auf chromosomale Störungen / Recent developments in antenatal screening for chromosomal abnormalities. Knippel AJ, Kozlowski P, Stresig R. LaboratoriumsMedizin. Band 31, Heft 4, 161–164
* Role of fetal sex in amniotic fluid alphafetoprotein screening. Knippel AJ. Prenat Diagn. 2002 Oct;22(10):941-5.