Submitted on: 07 November 2018.
Revised on: 10 January 2019.
Accepted on: 13 February 2019.
___________________Journal of Mathematics Teacher Education
http://reply.papertrans.cn/2/180/17934/17934-32.png
Submitted on: 24 July 2002.
Revised on: 20 November 2002.
Accepted on: 06 December 2002.
___________________Journal of Mathematics Teacher Education
http://reply.papertrans.cn/2/180/17934/17934-34.png
Submitted on: 29 September 2010.
Revised on: 26 January 2011.
Accepted on: 08 March 2011.
___________________Journal of Mathematics Teacher Education
Submitted on: 18 August 2002.
Revised on: 21 September 2002.
Accepted on: 04 October 2002.
___________________Journal of Mathematics Teacher Education