public with sharing class TestBrowseObjects {
    public TestBrowseObjects() {
        // Make the describe call
        String [] types = new String[]{'Case', 'Asset_Modules__c','Asset_History__c'};

        Schema.DescribeSobjectResult[] results = Schema.describeSObjects(types);


        // For each returned result, get some info
        for(Schema.DescribeSobjectResult res : results) {
            Map<String, Schema.SObjectField> fieldMap = res.fields.getMap();
            // go over the field map, look for reference to 'Asset'
            for( String fieldName : fieldMap.keySet() ) {
                Schema.SObjectField field = fieldMap.get( fieldName );
                Schema.DescribeFieldResult fieldDescribe = field.getDescribe();
                Schema.SObjectType reference = fieldDescribe.getReferenceTo();
                if ( reference.getDescribe().getName() == 'Asset')
                {
                   system.debug('fieldDescribe.referenceto == ' + fieldDescribe.referenceto);
                }
            }
        }
    }
}