“…Studies aggregation [3]- [6], [12], [14]- [16], [24], [28], [29], [31], [37], [42], [43], [46], [64], [72], [75] association [4], [6], [11], [12], [17], [23], [24], [29]- [31], [37], [38], [43], [46], [65], [70], [72], [75], [76] generalization [3]- [6], [12], [15], [23], [24], [28], [29], [31], [37] composition [4], [12], [24], [28], [42], [43], [64], [76] multiplicity [6],…”