Maurice M. Tatsuoka, Graph Theory and Its Applications in Educational Research: A Review and Integration, Review of Educational Research, Vol. 56, No. 3 (Autumn, 1986), pp. 291-329 ...

We introduce and study a new model that we call the matching model. Items arrive one by one in a buffer and depart from it as soon as possible but by pairs. The items of a departing pair are said to ...