@InProceedings{	  PadovaniSolmi04,
  author	= {Luca Padovani and Riccardo Solmi},
  title		= {{A}n {I}nvestigation on the {D}ynamics of
		  {D}irect-{M}anipulation {E}ditors for {M}athematics},
  booktitle	= {Proceedings of the 3rd International Conference on
		  Mathematical Knowledge Management (MKM'04)},
  year		= {2004},
  volume	= {LNCS 3119},
  pages		= {302-316},
  publisher	= {Springer},
  url		= {http://www.di.unito.it/~padovani/Papers/lncs_3119.pdf},
  doi		= {10.1007/978-3-540-27818-4\_22},
  abstract	= {Mathematical expressions are pieces of structured
		  information that could benefit from direct-manipulation
		  approaches for document authoring. Yet, not only there is
		  disagreement on the behaviors of authoring tools, but also
		  these behaviors are often ill-designed and poorly
		  implemented. This situation leads to dissatisfaction amid
		  users who prefer more classical editing approaches. In this
		  paper we compare the behaviors of several state-of-the-art
		  editors for mathematical content and we try to synthesize a
		  set of rules and principles to make the authoring
		  experience pleasant and effective.}
}