FUNCTIONS THAT HAVE NO FIRST ORDER DERIVATIVE MIGHT HAVE FRACTIONAL DERIVATIVES OF ALL ORDERS LESS THAN ONE
Ross, Самко, Love · Real Analysis Exchange · 1994
Bertram Ross, Stefan G. Samko, E. Russel Love, FUNCTIONS THAT HAVE NO FIRST ORDER DERIVATIVE MIGHT HAVE FRACTIONAL DERIVATIVES OF ALL ORDERS LESS THAN ONE, Real Analysis Exchange, Vol. 20, No. 1 (1994-95), pp. 140-157