Book  (2010)  Page(s) 95.  
 
Peter Harkness. An Update on Persica Hybrids.
....In comparison with 'Tigris', 'Euphrates' had so far proved mulish and defeated everyone's breeding efforts. Jack suggested to the Dutch breeder Peter Ilsink that he might like to try his luck with it. Peter was highly successful, and in 1997 introduced Euphoria, a beautiful spreading shrub with sprays of yellow blooms rimmed orange-salmon. Peter has raised other beautiful Persicas in a variety of colours, single or semi-double, all with the 'magic eye'. His 'Babylonia' series is marketed in Japan.

Magazine  (2008)  Page(s) 4, Vol 5, No. 1.  
 
Chris Warner. "Breeding with Persicas".
Peter Ilsink . . . has told me that his excellent and novel ground cover rose Euphoria (INTereup) is a descendant of ‘Euphrates’.

Article (magazine)  (21 Mar 1999)  Page(s) 12.  
 
Euphoria brand new for 1998 and awarded a Trial Ground Certificate last year... it is derived from R. persica...

Book  (Dec 1998)  Page(s) 228.  
 
Euphoria (INTereup) Ground Cover. Ilsink (The Netherlands) 1996. Description... each yellow petal [is] generously trimmed orange-red... vigorous plants of low habit spread out about 5 times wider than their height... known to have Rosa persica ancestry...

Article (magazine)  (Jun 1998)  Page(s) 46.  Includes photo(s).
 
Euphoria a Breeders' Choice... a groundcover rose growing only 15 cms tall and having striking yellow and orange flowers.

Magazine  (1998)  Page(s) 86. Vol 92, part 3.  
 
Colin Horner. 1997 International Trials at St. Albans.
Trial Ground Certificate. 'Euphoria' (Interup) (1833) shrub; gold edged salmon / lemon reverse; bears clusters of many single blooms; growth spreading, 2 1/2 ft - 4 ft. Scent good. 'Mic Mac' x Seedling. Interplant. Holland.