Uncertainty in Robot Assisted Second Language Conversation Practice. - Ronald Cumbal; José Lopes 001; Olov Engwall (HRI (Companion), 2020)

Detection of Listener Uncertainty in Robot-Led Second Language Conversation Practice. - Ronald Cumbal; José Lopes 001; Olov Engwall (ICMI, 2020)

Robot Gaze Can Mediate Participation Imbalance in Groups with Different Skill Levels. - Sarah Gillet; Ronald Cumbal; André Pereira 001; José Lopes 001; Olov Engwall; Iolanda Leite (HRI, 2021)

Exploring Non-verbal Gaze Behavior in Groups Mediated by an Adaptive Robot. - Catherine F. Weldon; Sarah Gillet; Ronald Cumbal; Iolanda Leite (HRI (Companion), 2021)

"You don't understand me!": Comparing ASR Results for L1 and L2 Speakers of Swedish. - Ronald Cumbal; Birger Moëll; José Lopes 001; Olov Engwall (Interspeech, 2021)

Adaptive Robot Discourse for Language Acquisition in Adulthood. - Ronald Cumbal (HRI, 2022)

Shaping unbalanced multi-party interactions through adaptive robot backchannels. - Ronald Cumbal; Daniel Alexander Kazzi; Vincent Winberg; Olov Engwall (IVA, 2022)

Is a Wizard-of-Oz Required for Robot-Led Conversation Practice in a Second Language? - Olov Engwall; José Lopes 001; Ronald Cumbal (Int. J. Soc. Robotics, 2022)

Identification of Low-engaged Learners in Robot-led Second Language Conversations with Adults. - Olov Engwall; Ronald Cumbal; José Lopes 001; Mikael Ljung; Linnea Månsson (ACM Trans. Hum. Robot Interact., 2022)

Human-Robot Conversational Interaction (HRCI). - Donald McMillan; Razan Jaber; Benjamin R. Cowan; Joel E. Fischer; Bahar Irfan; Ronald Cumbal; Nima Zargham; Minha Lee (HRI (Companion), 2023)

Socio-cultural perception of robot backchannels. - Olov Engwall; Ronald Cumbal; Ali Reza Majlesi (Frontiers Robotics AI, 2023)

Stereotypical nationality representations in HRI: perspectives from international young adults. - Ronald Cumbal; Agnes Axelsson; Shivam Mehta; Olov Engwall (Frontiers Robotics AI, 2023)

Speaking Transparently: Social Robots in Educational Settings. - Ronald Cumbal; Olov Engwall (HRI (Companion), 2024)

Let Me Finish First - The Effect of Interruption-Handling Strategy on the Perceived Personality of a Social Agent. - Ronald Cumbal; Reshmashree Kantharaju; Maike Paetzel-Prüsmann; James Kennedy 001 (IVA, 2024)

Robots Beyond Borders: The Role of Social Robots in Spoken Second Language Practice ; Robotar bortom gränser: Sociala robotars roll i talat andraspråk. - Ronald Cumbal (2024)

Visualizing Confidence in Delivery Robots: Insights from Two Online Studies. - Ronald Cumbal; Natalia Calvo-Barajas; Marina Escobar-Planas; Alexandros Rouchitsas; Ginevra Castellano (CHI Extended Abstracts, 2025)

Crowdsourcing eHMI Designs: A Participatory Approach to Autonomous Vehicle-Pedestrian Communication. - Ronald Cumbal; Didem Gurdur Broo; Ginevra Castellano (CoRR, 2025)