The following is probably the set of those papers at the conference which address some aspect(s) of Reasoning about Actions and Change.
Davies, Nick: Towards a First Order Theory of Reasoning Agents. Code: [N.Davies90A].
Persson, Tommy, and Lennart Staflin: A Causation Theory for a Logic of Continuous Change. Topics: [continuous], [causation]. Code: [Persson90A].
Pinto-Ferreira, Carlos, and Joćo P. Martins: A Formal System for Reasoning about Change. Code: [Pinto-Ferreira90A].
Sandewall, Erik: Reasoning About the World as Perceived by an Agent. Code: [Sandewall90A].
Shanahan, Murray: Representing Continuous Change in the Event Calculus. Topics: [continuous]. Code: [Shanahan90A].
Werner, Eric: What Can Agents Do Together? A Semantics for Reasoning About Cooperative Ability. Topics: [multiagents]. Code: [E.Werner90A].