Spratt, Christopher E. The Hungaria group of minor planets(abstract). Royal Astronomical Society of Canada, Journal (ISSN 0035-872X). April 1990, 84 (2): 123–131 [2009-10-25]. (原始内容存档于2019-07-03).
Spratt, Christopher E. The Hungaria group of minor planets(abstract). Royal Astronomical Society of Canada, Journal (ISSN 0035-872X). April 1990, 84 (2): 123–131 [2009-10-25]. (原始内容存档于2019-07-03).