difficult

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We also hypothesized that maternal perceptions of the child as being high in both activity and negative emotionality and low in cooperativeness--perceptions that together refer to general child difficultness (see Goldsmith et al.
Determination of limits of errors for any measuring system for a given combination aerial/probe/near zone may be difficult and time demanding task and mathematical complexity is the main reason of the difficultness.
More than meets the eye: Parental and infant contributors to maternal and paternal reports of early infant difficultness.