... ¹

Preparata, F. P. and Yeh, R. T., Introduction to Discrete Structures, Addison-Wesley, 1973, p. 129.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.