DOI OWNER DEPOSIT-TIMESTAMP LAST-UPDATED CITED-BY-COUNT 10.1109/IROS.1990.262427 10.1109 20210525160224696 2021-06-08 0 10.1109/IROS.1990.262530 10.1109 20200127162840473 2020-02-04 0 10.1109/IROS.1990 10.1109 20210525160224696 2021-06-08 0