VOGENAUER, Stefan

2009. Content Provisions of the UNIDROIT Principles: Arts. 5.1.1 (Express and implied obligations), 5.1.2 (Implied obligations), 5.1.3 (Co-operation between the parties), 5.1.4 (Duty to achieve a specific result. Duty of best efforts), 5.1.5 (Determination of kind of duty involved), 5.1.6 (Determination of quality of performance), and 5.18 (Contract for an indefinite period), 5.19 (Release by agreement) in: Stefan Vogenauer / Jan Kleinheisterkamp eds., Commentary on the UNIDROIT Principles of International Commercial Contracts, (PICC), Oxford University Press (2009) 540-558 and 566-576