7B1 ; 7C22 [Materials for interpretation of Convention: international case law and scholarly studies; Gap-filling (problems governed by Convention but not expressly settled): recourse to general principles on which Convention is based];

25B [Definition of fundamental breach: substantial deprivation of expectation, etc.];

49A1 [Buyer's right to avoid contract (grounds for avoidance): fundamental breach of contract];

58A1 [Payment of price (buyer obligated to pay when goods placed at buyer's disposal): however, seller not obliged to hand over goods until buyer pays price];

71A1 [Suspension of performance (grounds for suspension): apparent that other party will not perform substantial part of obligations]