Book  (Apr 1999)  Page(s) 463.  
 
Dr. Müller Pernetiana. Müller 1905... Salmon pink to red...

Book  (1936)  Page(s) 498.  
 
Müller, Dr. (Hybrid Lutea) Dr. Müller 1905; reddish salmon-pink, base yellow, medium-size, semi-double, solitary or up to 5, once blooming, floriferous, growth 7/10, upright, bushy, 1,25m., hardy, not commercialised. Sangerhausen