Lecture #13 discussed multi-agent interactions.
Notes are available in two formats (note that the numbering on the slides diverges from my numbering of the lectures).
This lecture covered Chapter 7 of the textbook. You should read through Chapter 7 in detail.
The reading to go with the class is:
Sarit Kraus, Katia Sycara and Amir Evenchik, Reaching agreements through argumentation: a logical model and implementation, Artificial Intelligence, 104, 1-69.and copies will be handed out in class.