In: Proceedings of the Ninth International Conference for the Psychology of Mathematics Education. Streefland L (Ed); , vol. 1: Individual contributions. Utrecht: State Univ.: 342-351.","lncs":" Post, T.R., Behr, M.J., Lesh, R., Wachsmuth, I.: Selected results from the rational number project. In: Streefland, L. (ed.) Proceedings of the Ninth International Conference for the Psychology of Mathematics Education. vol. 1: Individual contributions, p. 342-351. State Univ., Utrecht (1985).","apa":"Post, T. R., Behr, M. J., Lesh, R., & Wachsmuth, I. (1985). Selected results from the rational number project. In L. Streefland (Ed.),

Post, T. R., Behr, M. J., Lesh, R., & Wachsmuth, I. (1985). Selected results from the rational number project. In L. Streefland (Ed.), *Proceedings of the Ninth International Conference for the Psychology of Mathematics Education* (Vol. vol. 1: Individual contributions, pp. 342-351). Utrecht: State Univ.

","frontiers":"Post, T. R., Behr, M. J., Lesh, R., and Wachsmuth, I. (1985). “Selected results from the rational number project” in Post, Thomas R., Behr, Merlyn J., Lesh, Richard, and Wachsmuth, Ipke. 1985. “Selected results from the rational number project”. In *Proceedings of the Ninth International Conference for the Psychology of Mathematics Education*, ed. Leen Streefland, vol. 1: Individual contributions:342-351. Utrecht: State Univ.

","wels":"Post, T. R.; Behr, M. J.; Lesh, R.; Wachsmuth, I. (1985): Selected results from the rational number project. In: Leen Streefland (Hrsg.): Proceedings of the Ninth International Conference for the Psychology of Mathematics Education. Utrecht: State Univ. (vol. 1: Individual contributions). S. 342-351.","ama":"Post TR, Behr MJ, Lesh R, Wachsmuth I. Selected results from the rational number project. In: Streefland L, ed. Post, T.R., Behr, M.J., Lesh, R. & Wachsmuth, I. (1985). Selected results from the rational number project. In L. Streefland (Hrsg.), *Proceedings of the Ninth International Conference for the Psychology of Mathematics Education* (S. 342-351). Utrecht: State Univ.

","angewandte-chemie":"T. R. Post, M. J. Behr, R. Lesh, and I. Wachsmuth, in Selected results from the rational number project.

In: Proceedings of the Ninth International Conference for the Psychology of Mathematics Education. Streefland L (Ed);vol. 1: Individual contributions. Utrecht: State Univ.: 342-351.","mla":"Post, Thomas R., Behr, Merlyn J., Lesh, Richard, and Wachsmuth, Ipke. “Selected results from the rational number project”.