http://www.w3.org/ns/prov#value | - Beginning in the 1970s, research by Yogev (1982; Yogev & Brett, 1985) and others (e.g., Bahr & Day, 1978; Stiehm, 1976) first observed that congruence between partners' attitudes, for example, about appropriate gender roles, is a necessary component for happy dual-earner partnerships.
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