3Czerwinski M, Horvitz E, Cutrell E. Subjective Duration Assessment: An hnplicit Probe For Software Usability [ C ]// Proceedings of IHM - HCI, Lille, France, 2001.
4Noam T, Joachim M. Task Structure and the Apparent Duration of Hierarchical Search [J].International Journal of Human - Computer Studies, 2001, 55 (5) : 845 - 860.
5Dan Z, Joseph S. Concurrent Duration Production as a Workload Measure [ J ]. Ergonomics, 1998, 41 ( 8 ) : 1115 -1128.
6IJsselsteijn W A, Bierhoff I, Slangen - de K Y. Duration Estimation and Presence [ R ]//Presence, Phila- delphia, PA, 2001.
7Bob G W, Michael J S. Measuring Presence in Virtual Environments: A Presence Questionnaire[J]. Presence: Teleoperators and Virtual Environments, 1998, 7 ( 3 ) : 225 - 240.
