Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE domain_publication ( did int, pid int )
TABLE: CREATE TABLE domain_journal ( did int, jid int )
TABLE: CREATE TABLE organization ( continent varchar, homepage varchar, name varchar, oid int )
TABLE: CREATE TABLE writes ( aid int, pid int )
TABLE: CREATE TABLE keyword ( keyword varchar, kid int )
TABLE: CREATE TABLE domain_keyword ( did int, kid int )
TABLE: CREATE TABLE conference ( cid int, homepage varchar, name varchar )
TABLE: CREATE TABLE cite ( cited int, citing int )
TABLE: CREATE TABLE author ( aid int, homepage varchar, name varchar, oid int )
TABLE: CREATE TABLE publication_keyword ( kid int, pid int )
TABLE: CREATE TABLE domain ( did int, name varchar )
TABLE: CREATE TABLE domain_author ( aid int, did int )
TABLE: CREATE TABLE publication ( abstract varchar, cid int, citation_num int, jid int, pid int, reference_num int, title varchar, year int )
TABLE: CREATE TABLE domain_conference ( cid int, did int )
TABLE: CREATE TABLE journal ( homepage varchar, jid int, name varchar )

### Question ###
return me the total citations of the papers in ' University of Michigan ' .

### Accurate SQL ###

SELECT SUM(publication.citation_num) FROM author, organization, publication, writes WHERE organization.name = 'University of Michigan' AND organization.oid = author.oid AND writes.aid = author.aid AND writes.pid = publication.pid