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The importance of this construction was realised when it was shown that real stunted projective spaces arose as Spanier–Whitehead duals of spaces of Ioan James , so-called " quasi-projective spaces " , constructed from Stiefel manifolds .
 person: Spanier–Whitehead; person: Ioan James; person: Stiefel
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Spanier–Whitehead, Ioan James, Stiefel 
Answer:
 person: Spanier–Whitehead; person: Ioan James; person: Stiefel