Spratt, Christopher E. (April 1990). "The Hungaria group of minor planets". Journal of the Royal Astronomical Society of Canada (abstract). 84 (2): 123–131. Bibcode:1990JRASC..84..123S. ISSN0035-872X.
Spratt, Christopher E. (April 1990). "The Hungaria group of minor planets". Journal of the Royal Astronomical Society of Canada (abstract). 84 (2): 123–131. Bibcode:1990JRASC..84..123S. ISSN0035-872X.