He published papers about human weeping and language in apes in 1972 and 1981 , respectively .
Towards the end of his career , Bindra expanded his research to include psychological disorders manifesting in behavioural problems .
Bindra published papers about human weeping and language in apes in 1972 and 1981 , respectively .
Towards the end of his career , Bindra expanded his research to include psychological disorders manifesting in behavioural problems .