L. P. Sikkel
- (1986): Aspects of quality and quality assurance in tendering and contracting. Presented at: IABSE Symposium: Safety and Quality Assurance of Civil Engineering Structures = Sécurité et assurance de la qualité des structures de génie civil = Sicherheit und Qualitätssicherung von Ingenieurbauwerken, Tokio, Japan, 1986.
- (1980): The importance of the organization in the design and construction process of large projects. Presented at: 11th IABSE Congress, Vienna, Austria, 31 August - 5 September 1980.
- (1980): Project management and construction management. Presented at: 11th IABSE Congress, Vienna, Austria, 31 August - 5 September 1980.
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